Long time to authorize

[q000p]

If I connect from another network, I will timeout before success authorization up to 9 seconds. If I connect from the same network, all will work correctly. As example device have IP 192.168.223.40: root@Decoder:/etc/dropbear# dropbear -F -E -r dropbear_ed25519_host_key [26237] Nov 30 08:58:03 Not backgrounding [26319] Nov 30 08:58:12 Child connection from 192.168.223.1:37902 [26319] Nov 30 08:58:14 Password auth succeeded for 'root' from 192.168.223.1:37902 [26319] Nov 30 08:58:18 Exit (root) from <192.168.223.1:37902>: Disconnect received [26416] Nov 30 08:58:22 Child connection from 192.168.59.17:56442 [26416] Nov 30 08:58:31 Pubkey auth succeeded for 'root' with ssh-rsa key SHA256:26OBMOgzbiRQj8cF6I3MM714tse/ag/dz7Lb4TkvPNE from 192.168.59.17:56442 [26416] Nov 30 08:58:36 Exit (root) from <192.168.59.17:56442>: Disconnect received [26237] Nov 30 08:58:40 Early exit: Terminated by signal As result I can input pass during 2 seconds from the same network And authorize from another network take 9 seconds (without time to type pass).

dropbear 2017.75 without this problem but too old

[mkj]

Can you get a tcpdump/wireshark capture of the failed session?

My first thoughts would be either DNS or network MTU has problems.

[q000p]

dump3.zip The session is not failed but so long.

[mkj]

Dropbear delays 5 seconds from accepting the connection and sending the first packet.

Did you compile Dropbear, or where is the package from? DNS seems a likely reason if it's different from different networks, but the default config for Dropbear is to disable host lookups (#define DO_HOST_LOOKUP 0).

Another possibility is that session key exchange crypto is slow. When you were connecting from different networks (which were fast), was it a different SSH client? What kind of device is Dropbear running on?

No.	Time	Source	Destination	Protocol	Length	Message type	Message type	Value	Info
5	0.004736	192.168.222.41	192.168.11.2	TCP	60		22		22 → 59661 [ACK] Seq=1 Ack=22 Win=64224 Len=0
6	5.031283	192.168.222.41	192.168.11.2	SSHv2	560		22		Server: Protocol (SSH-2.0-dropbear_2020.79), Key Exchange Init

[q000p]

I compiled dropbear with default options (as I understood with disable host lookups) I tried to connect from same PC to device. If network is different, I will have delay.

[mkj]

What hardware and OS is Dropbear running on?

What client are you using from each network?

[q000p]

The device based on ARMv7 and buildroot.

[q000p]

About clients: Last test was on OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2 The bug present also: OpenSSH_9.3p1, OpenSSL 1.1.1t 7 Feb 2023 OpenSSH_8.2p1 Ubuntu-4ubuntu0.9, OpenSSL 1.1.1f 31 Mar 2020

[mkj]

Can you send "ssh -vvv" output from both the fast and the slow networks?

Thanks

[q000p]

The same network: C:\Users\framegrabber>ssh [email protected] -vvv OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/config error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2 debug2: resolve_canonicalize: hostname 192.168.226.40 is address debug2: ssh_connect_direct debug1: Connecting to 192.168.226.40 [192.168.226.40] port 22. debug1: Connection established. debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_rsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_rsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_dsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_dsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ecdsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ecdsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519 error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ed25519 type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ed25519-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_xmss type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1 debug1: Remote protocol version 2.0, remote software version dropbear_2020.79 debug1: no match: dropbear_2020.79 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to 192.168.226.40:22 as 'root' debug3: hostkeys_foreach: reading file "C:\\Users\\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\\Users\\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 debug3: send packet: type 20 debug1: SSH2_MSG_KEXINIT sent debug3: receive packet: type 20 debug1: SSH2_MSG_KEXINIT received debug2: local client KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,[email protected],zlib debug2: compression stoc: none,[email protected],zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,[email protected] debug2: host key algorithms: ssh-ed25519,ecdsa-sha2-nistp256,rsa-sha2-256,ssh-rsa,ssh-dss debug2: ciphers ctos: [email protected],aes128-ctr,aes256-ctr debug2: ciphers stoc: [email protected],aes128-ctr,aes256-ctr debug2: MACs ctos: hmac-sha1,hmac-sha2-256 debug2: MACs stoc: hmac-sha1,hmac-sha2-256 debug2: compression ctos: none debug2: compression stoc: none debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none debug3: send packet: type 30 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug3: receive packet: type 31 debug1: Server host key: ecdsa-sha2-nistp256 SHA256:1Shqyzo7ByuUKYVK0aJ4UFncxEnSPiN+YAE618bfLYY debug3: hostkeys_foreach: reading file "C:\\Users\\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\\Users\\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug1: Host '192.168.226.40' is known and matches the ECDSA host key. debug1: Found key in C:\\Users\\framegrabber/.ssh/known_hosts:4 debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey out after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey in after 134217728 blocks debug3: unable to connect to pipe \\\\.\\pipe\\openssh-ssh-agent, error: 2 debug1: pubkey_prepare: ssh_get_authentication_socket: No such file or directory debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_rsa debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_dsa debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_ecdsa debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_ed25519 debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_xmss debug2: pubkey_prepare: done debug3: send packet: type 5 debug3: receive packet: type 7 debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-256,ssh-rsa,ssh-dss> debug3: receive packet: type 6 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug3: send packet: type 50 debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,password debug3: start over, passed a different list publickey,password debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_rsa debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_rsa: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_dsa debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_dsa: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_ecdsa debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_ecdsa: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_ed25519 debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_ed25519: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_xmss debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_xmss: No such file or directory debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password debug3: failed to open file:C:/dev/tty error:3 debug1: read_passphrase: can't open /dev/tty: No such file or directory [email protected]'s password:

The another network C:\Users\framegrabber>ssh [email protected] -vvv OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/config error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2 debug2: resolve_canonicalize: hostname 192.168.226.40 is address debug2: ssh_connect_direct debug1: Connecting to 192.168.226.40 [192.168.226.40] port 22. debug1: Connection established. debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_rsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_rsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_dsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_dsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ecdsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ecdsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519 error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ed25519 type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_ed25519-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_xmss type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert.pub error:2 debug1: identity file C:\\Users\\framegrabber/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1 debug1: Remote protocol version 2.0, remote software version dropbear_2020.79 debug1: no match: dropbear_2020.79 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to 192.168.226.40:22 as 'root' debug3: hostkeys_foreach: reading file "C:\\Users\\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\\Users\\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 debug3: send packet: type 20 debug1: SSH2_MSG_KEXINIT sent debug3: receive packet: type 20 debug1: SSH2_MSG_KEXINIT received debug2: local client KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,[email protected],zlib debug2: compression stoc: none,[email protected],zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,[email protected] debug2: host key algorithms: ssh-ed25519,ecdsa-sha2-nistp256,rsa-sha2-256,ssh-rsa,ssh-dss debug2: ciphers ctos: [email protected],aes128-ctr,aes256-ctr debug2: ciphers stoc: [email protected],aes128-ctr,aes256-ctr debug2: MACs ctos: hmac-sha1,hmac-sha2-256 debug2: MACs stoc: hmac-sha1,hmac-sha2-256 debug2: compression ctos: none debug2: compression stoc: none debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none debug3: send packet: type 30 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug3: receive packet: type 31 debug1: Server host key: ecdsa-sha2-nistp256 SHA256:1Shqyzo7ByuUKYVK0aJ4UFncxEnSPiN+YAE618bfLYY debug3: hostkeys_foreach: reading file "C:\\Users\\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\\Users\\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug1: Host '192.168.226.40' is known and matches the ECDSA host key. debug1: Found key in C:\\Users\\framegrabber/.ssh/known_hosts:4 debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey out after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey in after 134217728 blocks debug3: unable to connect to pipe \\\\.\\pipe\\openssh-ssh-agent, error: 2 debug1: pubkey_prepare: ssh_get_authentication_socket: No such file or directory debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_rsa debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_dsa debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_ecdsa debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_ed25519 debug1: Will attempt key: C:\\Users\\framegrabber/.ssh/id_xmss debug2: pubkey_prepare: done debug3: send packet: type 5 debug3: receive packet: type 7 debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-256,ssh-rsa,ssh-dss> debug3: receive packet: type 6 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug3: send packet: type 50 debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,password debug3: start over, passed a different list publickey,password debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_rsa debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_rsa: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_dsa debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_dsa: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_ecdsa debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_ecdsa: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_ed25519 debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_ed25519: No such file or directory debug1: Trying private key: C:\\Users\\framegrabber/.ssh/id_xmss debug3: no such identity: C:\\Users\\framegrabber/.ssh/id_xmss: No such file or directory debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password debug3: failed to open file:C:/dev/tty error:3 debug1: read_passphrase: can't open /dev/tty: No such file or directory [email protected]'s password:

[q000p]

As I understood all logs are identical.

[mkj]

It looks like the newlines got broken, can you try paste it differently?

[q000p]

The same network

C:\Users\framegrabber>ssh [email protected] -vvv OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/config error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2 debug2: resolve_canonicalize: hostname 192.168.226.40 is address debug2: ssh_connect_direct debug1: Connecting to 192.168.226.40 [192.168.226.40] port 22. debug1: Connection established. debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_rsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_rsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_dsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_dsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ecdsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ecdsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519 error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ed25519 type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ed25519-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_xmss type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1 debug1: Remote protocol version 2.0, remote software version dropbear_2020.79 debug1: no match: dropbear_2020.79 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to 192.168.226.40:22 as 'root' debug3: hostkeys_foreach: reading file "C:\Users\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\Users\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 debug3: send packet: type 20 debug1: SSH2_MSG_KEXINIT sent debug3: receive packet: type 20 debug1: SSH2_MSG_KEXINIT received debug2: local client KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,[email protected],zlib debug2: compression stoc: none,[email protected],zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,[email protected] debug2: host key algorithms: ssh-ed25519,ecdsa-sha2-nistp256,rsa-sha2-256,ssh-rsa,ssh-dss debug2: ciphers ctos: [email protected],aes128-ctr,aes256-ctr debug2: ciphers stoc: [email protected],aes128-ctr,aes256-ctr debug2: MACs ctos: hmac-sha1,hmac-sha2-256 debug2: MACs stoc: hmac-sha1,hmac-sha2-256 debug2: compression ctos: none debug2: compression stoc: none debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: [email protected] MAC: compression: none debug1: kex: client->server cipher: [email protected] MAC: compression: none debug3: send packet: type 30 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug3: receive packet: type 31 debug1: Server host key: ecdsa-sha2-nistp256 SHA256:1Shqyzo7ByuUKYVK0aJ4UFncxEnSPiN+YAE618bfLYY debug3: hostkeys_foreach: reading file "C:\Users\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\Users\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug1: Host '192.168.226.40' is known and matches the ECDSA host key. debug1: Found key in C:\Users\framegrabber/.ssh/known_hosts:4 debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey out after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey in after 134217728 blocks debug3: unable to connect to pipe \\.\pipe\openssh-ssh-agent, error: 2 debug1: pubkey_prepare: ssh_get_authentication_socket: No such file or directory debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_rsa debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_dsa debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_ecdsa debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_ed25519 debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_xmss debug2: pubkey_prepare: done debug3: send packet: type 5 debug3: receive packet: type 7 debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-256,ssh-rsa,ssh-dss> debug3: receive packet: type 6 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug3: send packet: type 50 debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,password debug3: start over, passed a different list publickey,password debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Trying private key: C:\Users\framegrabber/.ssh/id_rsa debug3: no such identity: C:\Users\framegrabber/.ssh/id_rsa: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_dsa debug3: no such identity: C:\Users\framegrabber/.ssh/id_dsa: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_ecdsa debug3: no such identity: C:\Users\framegrabber/.ssh/id_ecdsa: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_ed25519 debug3: no such identity: C:\Users\framegrabber/.ssh/id_ed25519: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_xmss debug3: no such identity: C:\Users\framegrabber/.ssh/id_xmss: No such file or directory debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password debug3: failed to open file:C:/dev/tty error:3 debug1: read_passphrase: can't open /dev/tty: No such file or directory [email protected]'s password:

[q000p]

The different network

C:\Users\framegrabber>ssh [email protected] -vvv OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/config error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2 debug2: resolve_canonicalize: hostname 192.168.226.40 is address debug2: ssh_connect_direct debug1: Connecting to 192.168.226.40 [192.168.226.40] port 22. debug1: Connection established. debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_rsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_rsa-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_rsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_dsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_dsa-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_dsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ecdsa type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ecdsa-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ecdsa-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519 error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ed25519 type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_ed25519-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_ed25519-cert type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_xmss type -1 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert error:2 debug3: Failed to open file:C:/Users/framegrabber/.ssh/id_xmss-cert.pub error:2 debug1: identity file C:\Users\framegrabber/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1 debug1: Remote protocol version 2.0, remote software version dropbear_2020.79 debug1: no match: dropbear_2020.79 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to 192.168.226.40:22 as 'root' debug3: hostkeys_foreach: reading file "C:\Users\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\Users\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 debug3: send packet: type 20 debug1: SSH2_MSG_KEXINIT sent debug3: receive packet: type 20 debug1: SSH2_MSG_KEXINIT received debug2: local client KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,[email protected],zlib debug2: compression stoc: none,[email protected],zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,[email protected] debug2: host key algorithms: ssh-ed25519,ecdsa-sha2-nistp256,rsa-sha2-256,ssh-rsa,ssh-dss debug2: ciphers ctos: [email protected],aes128-ctr,aes256-ctr debug2: ciphers stoc: [email protected],aes128-ctr,aes256-ctr debug2: MACs ctos: hmac-sha1,hmac-sha2-256 debug2: MACs stoc: hmac-sha1,hmac-sha2-256 debug2: compression ctos: none debug2: compression stoc: none debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: [email protected] MAC: compression: none debug1: kex: client->server cipher: [email protected] MAC: compression: none debug3: send packet: type 30 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug3: receive packet: type 31 debug1: Server host key: ecdsa-sha2-nistp256 SHA256:1Shqyzo7ByuUKYVK0aJ4UFncxEnSPiN+YAE618bfLYY debug3: hostkeys_foreach: reading file "C:\Users\framegrabber/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file C:\Users\framegrabber/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys from 192.168.226.40 debug3: Failed to open file:C:/Users/framegrabber/.ssh/known_hosts2 error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2 debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2 debug1: Host '192.168.226.40' is known and matches the ECDSA host key. debug1: Found key in C:\Users\framegrabber/.ssh/known_hosts:4 debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey out after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey in after 134217728 blocks debug3: unable to connect to pipe \\.\pipe\openssh-ssh-agent, error: 2 debug1: pubkey_prepare: ssh_get_authentication_socket: No such file or directory debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_rsa debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_dsa debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_ecdsa debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_ed25519 debug1: Will attempt key: C:\Users\framegrabber/.ssh/id_xmss debug2: pubkey_prepare: done debug3: send packet: type 5 debug3: receive packet: type 7 debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-256,ssh-rsa,ssh-dss> debug3: receive packet: type 6 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug3: send packet: type 50 debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,password debug3: start over, passed a different list publickey,password debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Trying private key: C:\Users\framegrabber/.ssh/id_rsa debug3: no such identity: C:\Users\framegrabber/.ssh/id_rsa: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_dsa debug3: no such identity: C:\Users\framegrabber/.ssh/id_dsa: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_ecdsa debug3: no such identity: C:\Users\framegrabber/.ssh/id_ecdsa: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_ed25519 debug3: no such identity: C:\Users\framegrabber/.ssh/id_ed25519: No such file or directory debug1: Trying private key: C:\Users\framegrabber/.ssh/id_xmss debug3: no such identity: C:\Users\framegrabber/.ssh/id_xmss: No such file or directory debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password debug3: failed to open file:C:/dev/tty error:3 debug1: read_passphrase: can't open /dev/tty: No such file or directory [email protected]'s password:

[mkj]

OK, nothing obvious there.

Are there any other connections being made to the SSH server at the same time by chance? (Wondering if it's the pre-auth per-IP limit. Seems unlikely).

[q000p]

No. The client PC moved from one network to another.