POP3 Mail Server Publishing Rule Fails on ISA2004

Hello, experts.

I'm running ISA2004 with Service Pack 3.

I had a POP3 Mail Server Publishing rule working since I built this machine about 3 weeks ago.  Suddenly it stopped working.  No errors, no alerts, no indications why.

On the Outlook Express client, we get a error 800ccc0f, "server unexpectedly terminated the connection".

On the ISA 2004 logging screen, I see "Initiated Connection" and then "Closed Connection" about 25 seconds later.

Running 2 Ethereal screens on the ISA 2004, one looking at the outside nic, the other at the inside nic, I see port 110 packets coming in from the outside and being answered by the firewall but no port 110 packets forwarded to the mail server on the inside NIC.

I've disabled and re-enabled the rule.  I've deleted and rebuilt the rule.  I even tried moving the rule to listen on a different outside IP address.  But it doesn't seem to matter what I do, this ISA server no longer wants to deal in port 110!

I also ran the BPA and didn't see anything regarding this rule or anything else of any importance.  The event logs have nothing regarding this.

Is it possible I have some kind of weird hardware problem?  I'm running this ISA server on a Dell Dimension 3100 with 2 processors and 2gb of ram.  Is it possible the 2 processors is the problem?

Any help would be greatly appreciated.

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gateguardAuthor Commented:
Got it!

Symantec anti-virus.

Disable the "internet email auto-protect" and suddenly the POP3 mail flows!

No idea why this suddenly started happening when it wasn't happening before.

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