The setup: Thunderbird email client, courier-imap 3.0.8, this problem
happens from both windows and linux clients, running various recent
versions of Thunderbird. No firewall or router between client and
server, all on same subnet.
The symptoms are that for folders with large numbers of messages (around
> 2000) the operations timeout after exactly 60 seconds. By operations
I mean if I click on a folder to open it, exactly 60 seconds after the
Thunderbird status bar reports Opening Folder... it will report
"connection to server timed out". If I do have a large folder opened
successfully and I select all messages and attempt to drag to Trash,
again, exactly 60 seconds after Thunderbird reports "Moving messages to
INBOX.Trash" it will time out.
With logging on, nothing at all appears in the courier-imap log at the
moment of timeout, and there are no TIMEOUT or DISCONNECTED messages
from these clients in the log. The server appears to be continuing to
complete the task, since I still see that the processes are active in
the output of 'top' even after the timeout. In the case of the moving
of messages, the size of Trash is growing, but the size of the original
folder is not shrinking.
Settings that might be related:
In courier-imap's imapd config file
MAXDAEMONS=100 (only in the mid-20s during the testing, so this isn't
coming into play)
MAXPERIP=10 (with Thunderbird set at max of 5 cached connections this
isn't coming into play either)
IMAP_IDLE_TIMEOUT=180
IMAP_ENHANCEDIDLE=0
Thunderbird has no timeout settings and the best I can discover online
is that "it has been reported that the default Thunderbird timeout
should be sufficient." So, I have no idea what that means but I do know
that in other setups Thunderbird can perform operations that last longer
than 60 seconds. I have max cached connections in Thunderbird currently
set to 3 but have tried with 1 and 5 with the same results.
I have tried this with logging turned off to see if logging itself was
causing the timeouts but there was no change in behavior.
Anyone have any thoughts as to what is happening here? I'm rather
stumped as to what to try next.
Thanks,
Fran
--
Fran Fabrizio
Senior Systems Analyst
Department of Computer and Information Sciences
University of Alabama at Birmingham
http://www.cis.uab.edu/
205.934.0653
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