TB 91.3.2 - TBSync 3.01 - EAS 2.0.1 - Could not connect to Server (UNKNOWN_NETWORK_ERROR) - after Exchange Updates

[n00bsi]

Your Exhange Admin told me that there are updates installed to exchange after I told him had problem to connect to my Calendar on Exchange Server.

Your environment

Linux

TbSync version: 3.01 EAS-4-TbSync version: 2.01 Thunderbird version: 91.3.2

Exchange 2016 Updates CU20 -> CU22

Expected behavior

It worked fine before Updates

Actual behavior

got Error: Could not connect to Server (UNKNOWN_NETWORK_ERROR)

Steps to reproduce

Create a new Profile ( thunderbird -p ) Install: tbsync-3.0.1-tb.xpi, provider_fur_exchange_activesync-2.0.1-tb.xpi

Configure Account Settings in TBSync

To help resolving your issue, enable debug logging (TbSync Account Manager -> Help) and send me the debug.log via e-mail (use the title of your issue as subject of the email).

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [setSyncState] : State: prepare.request.options, Account: hansmustermann

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [Sending] : OPTIONS https://mailsrv.domain.tld/Microsoft-Server-ActiveSync

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [setSyncState] : State: send.request.options, Account: hansmustermann

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [EAS OPTIONS with response (status: 0)] : responseText: responseHeader(MS-ASProtocolVersions): null responseHeader(MS-ASProtocolCommands): null

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [setSyncState] : State: prepare.request.setdeviceinfo, Account: hansmustermann

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [setSyncState] : State: send.request.setdeviceinfo, Account: hansmustermann

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [Sending (EAS v14.0)] : POST https://mailsrv.domain.tld/Microsoft-Server-ActiveSync?Cmd=Settings&User=hans.mustermann%40domain.tld.&DeviceType=TbSync&DeviceId=RFKB3726ba345ebfbf96a76799ad771x

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [EventLog] : network::UNKNOWN_NETWORK_ERROR

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [EventLog] : network::UNKNOWN_NETWORK_ERROR

** Mon Nov 29 2021 13:45:56 GMT+0100 (CET) ** [setSyncState] : State: accountdone, Account: hansmustermann

tyed: (EAS v2.5) too but the same Error

[jobisoft]

They may have disabled EAS.

[n00bsi]

hi jobisoft,

the Exchange Admin say no!

[jobisoft]

Then I am out of ideas. Network errors are most probably only debuggable on your side.

[ds2k5]

do you support http 2.0 ? The Admin told me that there was a change

[jobisoft]

Should be backward compatible. But I have no further idea. Your server is just not responding. https://en.wikipedia.org/wiki/HTTP/2#Differences_from_HTTP/1.1

[ds2k5]

If I open this URL in Browser: https://mailsrv.domain.ltd/Microsoft-Server-ActiveSync

got this:

The page cannot be displayed because the HTTP version is not supported.

[ds2k5]

wireshark did not show a communication between client and mailserver ( when EAS enable / retry connection ). ping is working, open ports I can see....

Is there a issue with new Thunderbird version ?

[jobisoft]

Hard to tell, you are the first one I know of who is connecting to an HTTP2 server. You re-install TB78 in a different folder and create a fresh test profile and see if the old TbSync is able to connect to your HTTP2 server. But I rather doubt that.

Alos: I have no idea how to initiate a HTTP2 connection.

[ds2k5]

Thundbird downgrade not possible with this distri

[n00bsi]

Got error: 502 / Communication Error (HTTP status 502) How to check if there is a SSL issue.... ?

have CA imported in Thunderbird... that the SSL should can be checked

on OWA I can not see the ActiveSync Device ID that TbSync-EAS Show

[n00bsi]

found it: proxy exculde was missing in TB

sorry!