doveadm sending invalid AUTHENTICATE to uw-imap

Stephan Bosch stephan at
Wed Feb 8 12:11:34 UTC 2023

Can you make a protocol log (tcp dump of commands sent by client and replies sent by server) for one of these sessions? e.g. using ngrep if connections aren't secured.

On 8-2-2023 05:24, Chris Candreva wrote:
> I'm migrating a legacy uw-imap system to Dovecot, on a Rocky (RHEL) 8
> server running Dovecot 2.3.16-3 from their repos. I am using a master user
> to import all users for an imaps connection from the old server to the
> new. On a trial run however, it worked for about half the users. Half are
> giving an error of the form:
> dsync(user): Error: imapc(host:993):
> Command '1 AUTHENTICATE PLAIN xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' failed with BAD:
> 1 Missing or invalid argument to AUTHENTICATE
> I can't seem to get the IMAP command for the users that did work. However,
> on the face of it, that is an invalid AUTHENTICATE command. If I take that
> string and brake it up into (what I've googled is) the proper form of
> multi-command form of
> +
> xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> then the login succeeds. I have not been able to find anyone else with
> this problem in my search. Is this a known issue, is there a way to force
> the multi-line AUTHENTICATE, something else I'm missing ? Any help is
> appreciate on this!
> -Chris

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