Mail dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>


We are facing an issue to connect outlook client on nethserver. Any ideas?

mail dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=, lip=, session=

thank you

which “name” of Outlook are you using (ex 2016)
which version of Outlook are you using (ex 16.0.15831.20098)

I can verify that your Outlook is using IMAP (well… the level of IMAP that Microsoft allows) from the error and i can deduce that your client should be connected via LAN…


I am using outlook 2019 O365.
Version 2211 Build 16.0.15831.20098) 64 bit

Yes that’s correct I am trying to connect via LAN. Thunderbird is working.

Fresh release from Microsoft as O365. I would bet that before still not happened and… only from a few days.
Which connection metod is Outlook using?
TLS + port 993 or STARTTLS + port 143?
I’d try to switch to the other one as diagnostic test.
Is used also an antivirus with mail filtering capabilities (and without outlook integration?)

Few workarounds possible

Option 1: ask to Microsoft how rollback to previous version
Option 2: wait for a patch from Microsoft or Dovecot project (i won’t bet on issue on mailserver side)
Option 3: if the error is unbearable, consider a temporary or definitive switch to webmail and/or Thunderbird or emClient.

This is a new fresh installation on beta enviroment.

I am using both ports and pop3/imap to test and not able to connect with the same error. No I don’t have any antivirus firewalls etc.


Finally it works with the below.



“good” and usual settings for any IMAP client.
Outlook sometimes thinks “knows best”, most of the times does not know that much; i started hating deeply Outlook 2019 when was quite tough to tell it “i know how to setup my mailbox, stop trying to doin’ by yourself and wrong!”