Slow connections to imapd *Urgent*

[Roland Pope]

----- Original Message -----
From: "Russell Gnann" <rgnann at corp.pol.net>
To: <info-cyrus at lists.andrew.cmu.edu>
Sent: Saturday, February 15, 2003 3:51 PM
Subject: Slow connections to imapd *Urgent*


> As of today we have been experiencing extremly slow connections to our
Cyrus
> IMAP server.  So far we have been unable to detemine any cause.
>
> We are running Cyrus 2.0.16 on a Sun E3500 with Solaris 7. We have no
> obvious problems with any of the hardware including NIC interface, CPU,
> Memory, or Disks.
>
> An example of the tests we have been running is using telnet to appempt a
> connection to port 143. When we initially start the master process this
has
> a fast connection and response from the IMAP server. As we continue this
> test the connection becomes slower and slower. It gets to the point that
it
> can take more than a minute to see a connection established and just as
long
> to see a response from the IMAP processes.
>
> We can find no indication from our resource untilization why this might be
> happening. Nothing is overly busy on the server.
>
> I was wondering if anyone else has had similar problems, or might have
some
> insight into the reason we might be experiencing this.
>
> Thanks for any help.


DNS lookups are frequently the cause of this sort of problem. I would make
sure you can access DNS from the server, and that you can resolve the IP
addresses of the incoming clients.

Roland