Hi Giulio,

I've seen microsoft clients give the username/password prompt when it
was unable to connect.

Check the amount of allowed pop3 or imap processes. Search for
MAXCHILDREN in your dbmail.conf file.
If you are using MySQL, check the max_connections setting in your my.cnf
file too.

Once I've even written a perl script bogus pop3 'daemon' that allowed
every username / password to connect and say that there were no new
messages. That way if my pop3 server was down for maintanance, outlook
wouldn't reset the users passwords.

Grtz, Casper

On Thu, 2008-11-06 at 12:40 +0100, Giulio Ferro wrote:

> This is unexplainable: many outlook clients complain that every now
> and then they're asked for username and password. The system
> seems to work correctly after that, but outlook just keeps asking for
> authentication...
> 
> I've looked in the logs and there are no slow queries, so I can't understand
> why this happens.
> 
> Does anybody has an inkling of where I should look into?
> 
> Thanks.
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