On Thu, 2008-03-13 at 11:35 +0100, Diego Liziero wrote:
Then I decided to use wireshark on the client PC and here is what I found: Mail clients are creating new connections to save sent mail to "Sent" imap folder. At the end of the authentication process the following helpful message is sent to client: "NO Maximum number of connections from user+IP exceeded"
Great. That's why. Our imap server is in dmz and all internal users are reaching this server natted from the same ip.
The fact is that error message doesn't appear in dovecot logs, and email clients don't say anything useful, either. (maybe dovecot should write it to /var/log/dovecot.log)
It is written as a disconnect reason:
dovecot: Mar 13 12:42:41 Info: imap-login: Maximum number of connections from user+IP exceeded: user=<tss>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
I thought Thunderbird was using max. 5 connections as default though, so why is this happening? Is it not 5 as default or did your users change it?