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Published 20 hours ago • verified publisher icon PowerShell

shell request failed on channel 0

Open madcatdev opened this issue 4 years ago • 12 comments

"OpenSSH for Windows" version OpenSSH_for_Windows_8.1p1

Server OperatingSystem Windows 10

Client OperatingSystem Windows 10

What is failing I cannot connect to my sshd with any ssh client, such as OpenSSH for Windows or Putty. I am trying to connect with "ssh [email protected]", and it fails with message "shell request failed on channel 0" Only when I type "ssh [email protected] cmd", I can get shell. Adding "ForceCommand cmd" to sshd_config did not help. My sshd_config differs from default only with string "PasswordAuthentication no".

Part of sshd log: 
Accepted publickey for *username* from 127.0.0.1 port 60715 ssh2: RSA ***KEY***
debug1: monitor_child_preauth: user has been authenticated by privileged process
debug3: mm_get_keystate: Waiting for new keys
debug3: mm_request_receive_expect entering: type 26
debug3: mm_request_receive entering
debug3: mm_get_keystate: GOT new keys
debug1: auth_activate_options: setting new authentication options [preauth]
debug2: userauth_pubkey: authenticated 1 pkalg rsa-sha2-512 [preauth]
debug3: user_specific_delay: user specific delay 0.000ms [preauth]
debug3: ensure_minimum_time_since: elapsed 27.000ms, delaying 1.776ms (requested 7.194ms) [preauth]
debug3: send packet: type 52 [preauth]
debug3: mm_request_send entering: type 26 [preauth]
debug3: mm_send_keystate: Finished sending state [preauth]
debug3: ReadFileEx() ERROR:109, io:00DE59B0
debug3: read - no more data, io:00DE59B0
debug1: monitor_read_log: child log fd closed
debug3: get_user_token - i am running as user, returning process token
debug1: Not running as SYSTEM: skipping loading user profile
debug3: spawning "C:\\Program Files\\OpenSSH\\sshd.exe" -ddd -z
User child is on pid 3864
debug3: send_rexec_state: entering fd = 6 config len 184
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: mm_request_receive entering
Part of ssh log: 
debug1: Authentication succeeded (publickey).
Authenticated to 127.0.0.1 ([127.0.0.1]:22).
debug1: channel 0: new [client-session]
debug1: Requesting [email protected]
debug1: Entering interactive session.
debug1: pledge: network
debug1: ENABLE_VIRTUAL_TERMINAL_INPUT is supported. Reading the VTSequence from console
debug1: ENABLE_VIRTUAL_TERMINAL_PROCESSING is supported. Console supports the ansi parsing
debug1: client_input_global_request: rtype [email protected] want_reply 0
shell request failed on channel 0

madcatdev avatar Aug 31 '20 11:08 madcatdev

@madcatdev - I don't see any error in sshd.log. Please run the sshd as the service and share the full sshd.log (with DEBUG3 enabled) also ssh client logs (ssh -vvv user@ip)

bagajjal avatar Sep 02 '20 17:09 bagajjal

@bagajjal okay, i dont know ho to run sshd as a service in debug mode, but here is verbose logs:

./sshd -ddd 
./sshd -ddd
debug2: load_server_config: filename __PROGRAMDATA__\\ssh/sshd_config
debug2: load_server_config: done config len = 184
debug2: parse_server_config: config __PROGRAMDATA__\\ssh/sshd_config len 184
debug3: __PROGRAMDATA__\\ssh/sshd_config:38 setting AuthorizedKeysFile .ssh/authorized_keys
debug3: __PROGRAMDATA__\\ssh/sshd_config:51 setting PasswordAuthentication no
debug3: __PROGRAMDATA__\\ssh/sshd_config:79 setting Subsystem sftp      sftp-server.exe
debug1: sshd version OpenSSH_for_Windows_8.1, LibreSSL 2.9.2
debug1: get_passwd: LookupAccountName() failed: 1332.
debug1: private host key #0: ssh-rsa ***REMOVED***
debug1: private host key #1: ecdsa-sha2-nistp256 ***REMOVED***
debug1: private host key #2: ssh-ed25519 ***REMOVED***
debug1: rexec_argv[0]='C:\\Program Files\\OpenSSH\\sshd.exe'
debug1: rexec_argv[1]='-ddd'
debug2: fd 3 setting O_NONBLOCK
debug3: sock_set_v6only: set socket 3 IPV6_V6ONLY
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug2: fd 4 setting O_NONBLOCK
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug3: fd 5 is not O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 8 config len 184
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
Connection from 127.0.0.1 port 65330 on 127.0.0.1 port 22
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_for_Windows_7.7
debug1: match: OpenSSH_for_Windows_7.7 pat OpenSSH* compat 0x04000000
debug2: fd 5 setting O_NONBLOCK
debug3: spawning "C:\\Program Files\\OpenSSH\\sshd.exe" -ddd -y
debug2: Network child is on pid 13396
debug3: send_rexec_state: entering fd = 4 config len 184
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: preauth child monitor started
debug1: list_hostkey_types: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
debug3: send packet: type 20 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug3: receive packet: type 20 [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug2: local server KEXINIT proposal [preauth]
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 [preauth]
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] [preauth]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] [preauth]
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 [preauth]
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 [preauth]
debug2: compression ctos: none,[email protected] [preauth]
debug2: compression stoc: none,[email protected] [preauth]
debug2: languages ctos:  [preauth]
debug2: languages stoc:  [preauth]
debug2: first_kex_follows 0  [preauth]
debug2: reserved 0  [preauth]
debug2: peer client KEXINIT proposal [preauth]
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-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c [preauth]
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa [preauth]
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] [preauth]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected] [preauth]
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 [preauth]
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 [preauth]
debug2: compression ctos: none [preauth]
debug2: compression stoc: none [preauth]
debug2: languages ctos:  [preauth]
debug2: languages stoc:  [preauth]
debug2: first_kex_follows 0  [preauth]
debug2: reserved 0  [preauth]
debug1: kex: algorithm: curve25519-sha256 [preauth]
debug1: kex: host key algorithm: ecdsa-sha2-nistp256 [preauth]
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug3: receive packet: type 30 [preauth]
debug3: mm_sshkey_sign entering [preauth]
debug3: mm_request_send entering: type 6 [preauth]
debug3: mm_sshkey_sign: waiting for MONITOR_ANS_SIGN [preauth]
debug3: mm_request_receive_expect entering: type 7 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 6
debug3: mm_answer_sign
debug3: mm_answer_sign: KEX signature 001544C8(99)
debug3: mm_request_send entering: type 7
debug2: monitor_read: 6 used once, disabling now
debug3: send packet: type 31 [preauth]
debug3: send packet: type 21 [preauth]
debug2: set_newkeys: mode 1 [preauth]
debug1: rekey out after 134217728 blocks [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: Sending SSH2_MSG_EXT_INFO [preauth]
debug3: send packet: type 7 [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug3: receive packet: type 21 [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug2: set_newkeys: mode 0 [preauth]
debug1: rekey in after 134217728 blocks [preauth]
debug1: KEX done [preauth]
debug3: receive packet: type 5 [preauth]
debug3: send packet: type 6 [preauth]
debug3: receive packet: type 50 [preauth]
debug1: userauth-request for user user service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
debug3: mm_getpwnamallow entering [preauth]
debug3: mm_request_send entering: type 8 [preauth]
debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM [preauth]
debug3: mm_request_receive_expect entering: type 9 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 8
debug3: mm_answer_pwnamallow
debug2: parse_server_config: config reprocess config len 184
debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
debug3: mm_request_send entering: type 9
debug2: monitor_read: 8 used once, disabling now
debug2: input_userauth_request: setting up authctxt for user [preauth]
debug3: mm_inform_authserv entering [preauth]
debug3: mm_request_send entering: type 4 [preauth]
debug2: input_userauth_request: try method none [preauth]
debug3: user_specific_delay: user specific delay 0.000ms [preauth]
debug3: ensure_minimum_time_since: elapsed 13.000ms, delaying 1.388ms (requested 7.194ms) [preauth]
debug3: userauth_finish: failure partial=0 next methods="publickey,keyboard-interactive" [preauth]
debug3: send packet: type 51 [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 4
debug3: mm_answer_authserv: service=ssh-connection, style=
debug2: monitor_read: 4 used once, disabling now
debug3: receive packet: type 50 [preauth]
debug1: userauth-request for user user service ssh-connection method publickey [preauth]
debug1: attempt 1 failures 0 [preauth]
debug2: input_userauth_request: try method publickey [preauth]
debug2: userauth_pubkey: valid user user querying public key rsa-sha2-512 ***REMOVED***[preauth]
debug1: userauth_pubkey: test pkalg rsa-sha2-512 pkblob RSA ***REMOVED*** [preauth]
debug3: mm_key_allowed entering [preauth]
debug3: mm_request_send entering: type 22 [preauth]
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED [preauth]
debug3: mm_request_receive_expect entering: type 23 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 22
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 000F10B8
debug1: trying public key file C:\\Users\\user\\.ssh/authorized_keys
debug1: C:\\Users\\user\\.ssh/authorized_keys:1: matching key found: RSA ***REMOVED***
debug1: C:\\Users\\user\\.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
Accepted key RSA ***REMOVED*** found at C:\\Users\\user\\.ssh/authorized_keys:1
debug3: mm_answer_keyallowed: publickey authentication test: RSA key is allowed
debug3: mm_request_send entering: type 23
debug3: send packet: type 60 [preauth]
debug2: userauth_pubkey: authenticated 0 pkalg rsa-sha2-512 [preauth]
debug3: user_specific_delay: user specific delay 0.000ms [preauth]
debug3: ensure_minimum_time_since: elapsed 21.000ms, delaying 7.776ms (requested 7.194ms) [preauth]
Postponed publickey for user from 127.0.0.1 port 65330 ssh2 [preauth]
debug3: receive packet: type 50 [preauth]
debug1: userauth-request for user user service ssh-connection method publickey [preauth]
debug1: attempt 2 failures 0 [preauth]
debug2: input_userauth_request: try method publickey [preauth]
debug2: userauth_pubkey: valid user user attempting public key rsa-sha2-512 ***REMOVED*** [preauth]
debug3: userauth_pubkey: have rsa-sha2-512 signature for RSA SHA256:***REMOVED*** [preauth]
debug3: mm_key_allowed entering [preauth]
debug3: mm_request_send entering: type 22 [preauth]
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED [preauth]
debug3: mm_request_receive_expect entering: type 23 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 22
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 000F0E88
debug1: trying public key file C:\\Users\\user\\.ssh/authorized_keys
debug1: C:\\Users\\user\\.ssh/authorized_keys:1: matching key found: RSA SHA256:***REMOVED***
debug1: C:\\Users\\user\\.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
Accepted key RSA SHA256:***REMOVED*** found at C:\\Users\\user\\.ssh/authorized_keys:1
debug3: mm_answer_keyallowed: publickey authentication: RSA key is allowed
debug3: mm_request_send entering: type 23
debug3: mm_sshkey_verify entering [preauth]
debug3: mm_request_send entering: type 24 [preauth]
debug3: mm_sshkey_verify: waiting for MONITOR_ANS_KEYVERIFY [preauth]
debug3: mm_request_receive_expect entering: type 25 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 24
debug3: mm_answer_keyverify: publickey 000F10B8 signature verified
debug1: auth_activate_options: setting new authentication options
debug3: mm_request_send entering: type 25
Accepted publickey for user from 127.0.0.1 port 65330 ssh2: RSA SHA256:***REMOVED***
debug1: monitor_child_preauth: user has been authenticated by privileged process
debug3: mm_get_keystate: Waiting for new keys
debug3: mm_request_receive_expect entering: type 26
debug3: mm_request_receive entering
debug3: mm_get_keystate: GOT new keys
debug1: auth_activate_options: setting new authentication options [preauth]
debug2: userauth_pubkey: authenticated 1 pkalg rsa-sha2-512 [preauth]
debug3: user_specific_delay: user specific delay 0.000ms [preauth]
debug3: ensure_minimum_time_since: elapsed 28.001ms, delaying 0.775ms (requested 7.194ms) [preauth]
debug3: send packet: type 52 [preauth]
debug3: mm_request_send entering: type 26 [preauth]
debug3: mm_send_keystate: Finished sending state [preauth]
debug3: ReadFileEx() ERROR:109, io:000FBEF0
debug3: read - no more data, io:000FBEF0
debug1: monitor_read_log: child log fd closed
debug3: get_user_token - i am running as user, returning process token
debug1: Not running as SYSTEM: skipping loading user profile
debug3: spawning "C:\\Program Files\\OpenSSH\\sshd.exe" -ddd -z
User child is on pid 4044
debug3: send_rexec_state: entering fd = 6 config len 184
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: ssh_msg_send: type 0
debug3: mm_request_receive entering
debug1: do_cleanup
PS C:\Program Files\OpenSSH>
ssh [email protected] -vvv 
PS C:\Users\user> ssh [email protected] -vvv
OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5
debug3: Failed to open file:C:/Users/user/.ssh/config error:2
debug1: Reading configuration data __PROGRAMDATA__\\ssh/ssh_config
debug2: resolve_canonicalize: hostname 127.0.0.1 is address
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 127.0.0.1 [127.0.0.1] port 22.
debug1: Connection established.
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_rsa type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa-cert.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_rsa-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_dsa error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_dsa.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_dsa type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_dsa-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_dsa-cert.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_dsa-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_ecdsa type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa-cert.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_ecdsa-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519 error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_ed25519 type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519-cert.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_ed25519-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_xmss type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss-cert.pub error:2
debug1: key_load_public: No such file or directory
debug1: identity file C:\\Users\\user/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_7.7
debug1: Remote protocol version 2.0, remote software version OpenSSH_for_Windows_8.1
debug1: match: OpenSSH_for_Windows_8.1 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 127.0.0.1:22 as 'user'
debug3: hostkeys_foreach: reading file "C:\\Users\\user/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file C:\\Users\\user/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 127.0.0.1
debug3: Failed to open file:C:/Users/user/.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-group-exchange-sha1,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],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
debug2: compression stoc: none
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-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
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
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]
debug2: compression stoc: none,[email protected]
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 ***REMOVED***
debug3: hostkeys_foreach: reading file "C:\\Users\\user/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file C:\\Users\\user/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 127.0.0.1
debug3: Failed to open file:C:/Users/user/.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 '127.0.0.1' is known and matches the ECDSA host key.
debug1: Found key in C:\\Users\\user/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey 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 after 134217728 blocks
debug2: key: ***REMOVED***, agent
debug2: key: C:\\Users\\user/.ssh/id_rsa (0000000000000000)
debug2: key: C:\\Users\\user/.ssh/id_dsa (0000000000000000)
debug2: key: C:\\Users\\user/.ssh/id_ecdsa (0000000000000000)
debug2: key: C:\\Users\\user/.ssh/id_ed25519 (0000000000000000)
debug2: key: C:\\Users\\user/.ssh/id_xmss (0000000000000000)
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,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
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,keyboard-interactive
debug3: start over, passed a different list publickey,keyboard-interactive
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: Offering public key: RSA SHA256:***REMOVED*** ***REMOVED***
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: pkalg rsa-sha2-512 blen 279
debug2: input_userauth_pk_ok: fp SHA256:***REMOVED***
debug3: sign_and_send_pubkey: RSA SHA256:***REMOVED***
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to 127.0.0.1 ([127.0.0.1]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug1: console supports the ansi parsing
debug3: Successfully set console output code page from:866 to 65001
debug3: Successfully set console input code page from:866 to 65001
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug3: receive packet: type 100
debug2: channel_input_status_confirm: type 100 id 0
shell request failed on channel 0
debug3: Successfully set console output code page from 65001 to 866
debug3: Successfully set console input code page from 65001 to 866
PS C:\Users\user>

madcatdev avatar Sep 13 '20 11:09 madcatdev

I'm also seeing this issue.

hotdogaaron avatar Sep 21 '20 16:09 hotdogaaron

  • It would be faaaar more helpful if you guys also posted your sshd_configfile.
  • Be sure that you are actually using the manually installed OpenSSH_for_Windows_8.1p1 and not something that came with windows.
  • Use SysInternals pslist64.exe -t to be sure you're not running multiple sshd sessions.
  • Be sure nothing is already using (default) SSH port 22 (on both machines). (Win10 sucks at sharing this port.)
  • There's a bug (#1681) that doesn't close the SSH session after you have stopped the SSHD server daemon.

eabase avatar Oct 13 '20 18:10 eabase

Even I am facing the issue with OpenSSH_for_Windows_8.1p1 on Windows 2012, but only when I use "-T" option (Do not allocate tty). If I don't use "-T", it works.

Please find the attached sshd, ssh client logs, sshd_config etc. sshd.log ssh-client.txt sshd_config.txt

badari412 avatar Mar 07 '21 13:03 badari412

@badari412 - This will be fixed in the next win32-openssh release targeted for April 2021. Please try the attached ssh.exe. ssh_nopty_bug.zip

bagajjal avatar Mar 09 '21 22:03 bagajjal

@bagajjal Thanks for your response. The file ssh.exe that you attached didn't help me. Correct me if I am wrong, but, isn't the issue at the server side?

Also, I saw you were talking about OpenSSH 8.5 release in April 2021 in another issue. Can you please let me know if OpenSSH 8.5 release in April will just be on github or will it be included as part of Windows 2019 OS Update? If yes, do you have an idea when it will be a part of OS update?

badari412 avatar Mar 12 '21 09:03 badari412

@badari412 - My bad. I had the wrong binary attached. please try the private sshd binary. please follow these steps

  1. take a backup of existing sshd.exe.
  2. net stop sshd - stop sshd service
  3. copy the private sshd.exe to your bin folder.
  4. net start sshd - start sshd service.
  5. ssh -T user@ip - This should provide you with nopty session.

sshd_nopty_issue.zip

OpenSSH v8.5 april release is planned for Github release. We wait for at least a month before we ship into windows. My plan is to ship into the next windows version during June month.

bagajjal avatar Mar 12 '21 18:03 bagajjal

We can only ship security patches into windows 2019.. OpenSSH v8.5 goes into the latest windows OS version.

bagajjal avatar Mar 12 '21 18:03 bagajjal

Hello @bagajjal , can you please share a win32 binary version of sshd.exe with the provided fix? thankyou!

101000 avatar Apr 15 '21 09:04 101000

I'm also seeing this issue.

BoyChai avatar Jul 24 '22 11:07 BoyChai

Please try to use Win64 @BoyChai even I was facing the similar issue. I used the 64 bit and I am not getting the error channel 0.

sidrockzz avatar Aug 09 '22 09:08 sidrockzz