----- Original Message ----- From: "Russell Gnann" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> 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