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geustace 01-06-2005 02:39 PM

FC3 / Courier-imap resource issue
Last weekend, I upgraded our mail server from FC2 to FC3. I also upgraded to the latest release of courier-imap. Since then the whole environment has had problems. I have downgraded courier-imap which had no beneficial effect and have upgraded to the 2.6.9-1.724_FC3 kernel.

The issue is that after a number of hours, it varies from 4 or 5 to a day, the imap daemons stop processing commands. It is possible to initiate new sessions but access to the maildirs seems to just hang, the client eventually getting a timeout or server not responding error.

Restarting the courier-imap service does not fix the problem but rebooting the server does (for a while).

The 3.0.3 version of courier-imap had been running fine on FC2.

I desperately need some help to try to resolve this problem, I will be rebuilding an FC2 disk over the coming weekend but would prefer to stay with FC3 if the problem can be identified and fixed.

So far I have had no response from the courier-users mailing list and as downgrading made no difference I suspect that I am exhausting a kernel resource but I don't know how to confirm this.

ghiss88 01-20-2005 10:42 AM

I have the same problem, we try to solve it.

Have you find a solution?

If we find the problem, I will post a new message.


uniksboy 02-12-2005 02:46 AM

This also happened in my FC3 setup. I did an lsof and found out that the gam_server daemon is opening too many files/sockets. I was able to solve this problem by upgrading to the latest gamin package which can be found at Download the source rpm ( and as root, do the following:

# rpm --rebuild gamin-0.0.23-1.src.rpm

# cd /usr/src/redhat/RPMS/i386

# rpm -Uvh gamin-*

Then I did a reboot.


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