On Tue, Jun 26, 2007 at 11:00:37AM +0100, Adrian wrote: > I'm having an intermittant problem with all the Windows machines on my LAN > connecting to Courier IMAP. Error messages is: > > Could not connect to server <foo.bar.server> connection was refused > > All machines are using Thundbird 2.04 as their IMAP client, machines > connecting from outside the LAN and my own machine which runs Linux do not > have the problem. > > Total number of similtaneous connections to the server I consider fairly low, > typically between 30 - 60. > > Machine is a Pentium D 3Ghz with 1GB RAM > CPU rarely hits double figures and generally stays below 5% > Mem usage is pretty low typically 600 -700 MB free with no swap space usage > Network Card is a Broadcom 10/100/1000 although looking at the output from > dmesg there is a line: > tg3: eth0: Link is up at 100 Mbps, full duplex > > which may be relevant. > > Any thoughts or suggestions greatfully received.
Did you see anything in your mail logs? If you have exceeded the MAXDAEMONS limit (default 40 connections) then you should get a message logged. However if you have exceeded MAXPERIP then I don't think you get a log. You probably should, but the way couriertcpd is written it's not easy to do. Use netstat -nt to determine how many simultaneous IMAP connections are originating from each client. Courier's default MAXPERIP limit is 4, but some IMAP clients originate 5 or more. If this is the problem you can either increase MAXPERIP, or you can configure the clients to use fewer connections. Googling for "thunderbird concurrent IMAP connections" turns up things like http://www.zimbra.com/forums/administrators/1527-setting-concurrent-imap-connection-limit.html which should show you how to adjust the clients. Brian. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Courier-imap mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-imap
