[Dovecot] dovecot: imap-login: Disconnected (no auth attempts)

[J4K]

Morning everyone,

	On the 8th of Jan the TLS/SSL certificate I use with Dovecot expired. I
replaced it with a new on the 9th of Jan.  I tested this with
Thunderbird and all is well.

This morning people tell me they cannot get their email using their
mobile telephones  :  K9 Mail

I have reverted the SSL cert back to the old one just in case.
Thunderbird will works.


Dovecot 1:1.2.15-7 running on Debian 6

The messages in the logs are:

Jan  9 10:11:37 logout dovecot: imap-login: Disconnected (no auth
attempts): rip=90.131.95.130, lip=88.119.95.13, TLS: Disconnected
Jan  9 10:11:38 logout dovecot: imap-login: Disconnected (no auth
attempts): rip=90.131.95.130, lip=88.119.95.13, TLS: Disconnected

In dovecot.conf I have this set :

disable_plaintext_auth = no

And the auth default mechanisms are set to:
  mechanisms = plain login

What is strange is the only item that changed is the SSL cert, which has
since been changed back to the old one (which has expired... ^^).

Any ideas where I may look or change?

Regards, S