Thank you! I really appreciate your help
Il 24/08/2020 18:37 Josef 'Jeff' Sipek <jeff.sipek@open-xchange.com> ha scritto:
On Mon, Aug 24, 2020 at 17:11:04 +0200, absolutely_free@libero.it wrote:
Hi,
last friday I upgraded from dovecot-2.3.10.1_2 to dovecot-2.3.11.3 (FreeBSD).
Since then, I started having some issues with some customers.
The log I see is like:
pop3-login: Disconnected (tried to use unsupported auth mechanism): user=<username@domain.it>, method=USER, rip=x,y,x,z, lip=x,y,w,z, session=<e5KkR5qto8hPAL9q>
While, before upgrade, same user logged succesfully:
pop3-login: Login: user=<username@domain.it>, method=PLAIN, rip=x,y,x,z, lip=x,y,w,z, mpid=62876, session=<dMRmGWCtFtJtdcy6>
The only thing that comes to mind is the pop3 issue where an auth attempt after a failed auth attempt would always fail. I'm not sure why the client that's having issues is failing the first attempt (unless it tries an unsupported mechanism first, and then tries to fall back to PLAIN). Anyway, there is a fix on the master branch.
https://github.com/dovecot/core/commit/d0ea7f9f4530878a40ae0275cf0c36d3ff911...
You can try to patch the 2.3.11.3 code with it and see if that helps. 2.3.12 and 2.3.11.4 (if there is one) will have this fix.
Jeff.
-- mainframe, n.: An obsolete device still used by thousands of obsolete companies serving billions of obsolete customers and making huge obsolete profits for their obsolete shareholders. And this year's run twice as fast as last year's.