Close_wait connections stops the service for Mail Security
Posted on 2006-06-22
We are having problems with Symantec Mail Security for SMTP 4.0 running on Windows server 2003. We have a mail server and also a Relay with our ISP, since last week we have experience a lot of delays in outgoing and incomming mails after relay server from our ISP was down for half day. Searching the log files in the Mail Security we can see there are many close_wait connections. The mail security 4.0 can handle only 100 connections at the same time so we are reaching that number in just a few minutes, that's causing a big queue in exchange that can´t be release and sometimes it chages state to RETRY.
For now, the only solution we have found is to stop mail security service, that will shut all the connections and start it again but we can't still release the queue. In the symantec logs file we see, in general, there are a lot of Could Not Contact Server and Timeout Exceeded errors, in our ISP they see a lot of "waiting for action from our mail server"
My question is if there is a possibilty we have a missconfiguration either in Mail Security or Exchange 2003 that never cause this problem before because we hadn't had such a big queue, or is still our ISP doing something that shouldn't. Or is just a coincidence of two problems at the same time (relay down and something else).
The problem is our queue is over 1000 mails and more than 1GB, is not a matter of bandwith, we have a frame relay E1 service, Exchange and mail security run in two different servers heavy enough.
I'll appreciate any answer you can tell me