[Dovecot] Intermittent authentication failures

[Eric Shubert]

On 09/30/2011 09:07 AM, Eric Shubert wrote:
>
> CRAM-MD5 works sometimes:
> Sep 30 08:15:43 imap-login: Info: Login: user=<userA at domain.com>,
> method=CRAM-MD5, rip=192.168.252.8, lip=192.168.252.14, mpid=20301
>
> but (seemingly more frequently) the authentication fails:
> Sep 30 08:16:41 imap-login: Info: Aborted login (auth failed, 1
> attempts): user=<userA at domain.com>, method=CRAM-MD5, rip=192.168.252.8,
> lip=192.168.252.14
>
> I restarted dovecot, and that apparently cleared the problem for one
> user, but not others.
>
> Is this perhaps a bug in dovecot, or would the problem lie with vpopmail?
>
> TIA for any pointers.
>

FWIW, I tried digest-md5, and experience the same problem.

Is it possible that passwords are being cached in such a way that 
different login mechanisms cannot be used by different client programs 
with the same user account?

-- 
-Eric 'shubes'