2.6 Kernel and POP issues

[Robert T. Covell]

Hello,
On a 2.6 Kernel (linux-2.6.18.1) pop connections stop working
completely.  People are able to connect once (sometimes) and then the
pop3 server will not let them connect again.  The connection hangs until
timeout.  When we switch back to a 2.4 Kernel (linux-2.4.33.3)
everything works like a charm.

IMAP does not seem to be affected.  We told our client base to use this
until we determined the problem (couldn't believe it was the kernel).

We built the 2.6 kernel from scratch and from the generic smp config
provided with the distro (thinking we missed something).  Both had the
same result.

In syslog we are seeing the following error on either a 2.4/2.6 kernel,
so I don't think this is an issue but it might be.

Nov 26 10:10:23 mail1 master[2665]: setrlimit: Unable to set file
descriptors limit to -1: Operation not permitted Nov 26 10:10:23 mail1
master[2665]: retrying with 1024 (current max)


Cyrus Version:	cyrus-imapd-2.2.12
Distro:		Slackware 11
CPU:			AMD 64 4600 Dual Core
Ram:			2GB
Drives:		3ware 7506-4LP Raid 5 (320 GB x 4)

Would really like to be on a new kernel if at all possible.  Any ideas?

-Bob