[Dovecot] Outlook 2000/2003 frequent disconnect issue

[Timo Sirainen]

On Wed, 2007-08-01 at 12:05 -0700, Jeff Ramsey wrote:
> Aug  1 11:58:51 imap dovecot: auth(default): passwd(QUINAULT- 
> ileneyoung,::ffff:10.200.254.110): lookup
> Aug  1 11:58:51 imap dovecot: auth(default): passwd(QUINAULT- 
> ileneyoung,::ffff:10.200.254.110): unknown user
..
> Perhaps this sheds some light on the matter? Why is it trying to  
> authenticate the user again at 11:58:51 when there was no disconnect  
> after 11:58:47?

Outlook just wanted to create yet another connection.

> And why is it failing? My guess on why it is failing  
> is because the Active Directory Server cannot respond fast enough to  
> handle the second request, after already handling the first, but I am  
> just guessing.

I think the problem has to do with NSS. It probably failed with some
error, but since unfortunately getpwnam() interface doesn't support
reporting errors, Dovecot just assumed that the user didn't exist.

I can't think of why this would work any differently with Dovecot
v0.99.x.

I think you should rather get rid of userdb passwd and configure Dovecot
to use userdb ldap to connect directly to your AD.

Using / not using nscd might also help.
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