[Dovecot] Tracing a server problem

[Steffen Kaiser]

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On Tue, 3 Feb 2009, Luigi Rosa wrote:

> Many users with different clients complain a lot of "server disconnected" errors.
>
> On the server side Doveco does not report any kind of error. I just ab an
> unusual rate of "IMAP(xxxxxx at xxxx): Disconnected: Logged out" entries.

http://wiki.dovecot.org/Debugging/Rawlog won't work for disconnections.

> Given that I am NOT sure about the ethernet an firewall performance, how can I
> trace this problem?

dump/trace the connection before and after the firewall to check out, what 
packets the clients sends and what are forwarded by the firewall.

Also make sure you trace all connections from the client, maybe the 
firewall drops if there are more than x connections.

If the connections breaks at "STARTTLS" command, try switching to SSL.

Bye,

- -- 
Steffen Kaiser
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