After update to 19.1.2360 (build 19.1.4142.0) Thunderbird (65) stopped to connect to some IMAP servers (dovecot).
Connection to IMAP server is set as STARTTLS and password (secured transfer) on the port 143. Connection to port 993 with SSL/TLS works.
I got the following error message from Thunderbird after connection timeout:
“IMAP server xxx doesn’t support selected authentication method.”
The capabilities of the dovecot server are:
OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ STARTTLS AUTH=PLAIN] Dovecot ready.
The previous version of Avast worked without any problem, I had to install only the certificate to Thunderbird.
I don’t know the background of TLS connection takeover, but there is something wrong.
No dev cares about that?
I have experienced the same issue also with SMTP server, SSL/TLS works, STARTTLS not.
Sometimes there is also problem with Firefox, that SSL certificate cannot be verified. I suspect the same bug within Avast.
Hello, I also have a problem with thunderbird and imap server, but with the new version it seems that it is no more possible to export certificate as shown in the official documentation !
So I have to shutoff Avast to be able to read my mail : very efficient anti virus suite…
I tried it now but it did’t help. There appeared only confirmation of SSL certificates issued/overtaken by Avast which couldn’t be verified.
I have installed Avast Root certificate in Windows certificate storage and Thunderbird storage as well.
Also tried to enable ALL ciphers and every TLS protocol within dovecot IMAP server. No success.
There has to be some change since the last Avast 18.x version which causes these problems.
I have exported SSL email certificate from Avast and installed it into Windows storage again, now certificates were validated properly.
But the problem with STARTSSL connection persists. I would like to help the devs to find the bug, but nobody has contacted me.