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My POP3 Server rule stopped working on ISA 2004 connecting to Exchange Server 2003

Posted on 2008-10-30
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Last Modified: 2012-05-05
I recently switched ISP's and consequently got new IP addresses so during the overlap period I built a new ISA2004 machine to replace my existing one (configuring the new one with the new IP addresses) and when cutover to the new service everything worked.

For awhile.

Now, suddenly, my POP3 Server rule fails to allow Outlook Express clients on the outside to connect to the inside mail server.  The error in outlook express is "unexpectedly terminated the connection" and on the ISA server, in logging, I see a connection made and then closed right away.

Any ideas?

Thanks.
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Question by:gateguard
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Expert Comment

by:Stephen Manderson
ID: 22843903
Can you please post the details of the access rule being used to connect to the POP.

Also did you publish the mail server or has the rule been created manually?

Lastly can you please post some of the error logs relating to this issue.

Regards
Steve
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Author Comment

by:gateguard
ID: 22845004
I used the server publishing wizard to create a POP3 Server.
General tab: POP3Server, enabled
Action: Allow, Log requests
Traffic: POP3 Server
From: External
To: 192.168.150.25, requests appear to come from original client
Networks: External, <correct outside address>
Schedule: Always

As far as errors:

In outlook express: "...server unexpectedly terminated the connection..."

On the ISA Server:

No errors but when I query the log file on this rule I see a series of initialized connection then closed connection with no indication why.

There are no events in the windows event log.
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Author Comment

by:gateguard
ID: 22845007
Also, running the Best Practices Analyzer doesn't report anything wrong with this rule.
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Stephen Manderson earned 500 total points
ID: 22845688
Are you able to telnet to the server on the POP port?

Regards
Steve
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Author Comment

by:gateguard
ID: 22852517
I found the problem.  It actually had nothing to do with my POP3 server rule.  A few days ago I set up a secure ftp server using a custom protocol and I misunderstood something I read about secure ftp wanting to have access to a large number of upper-range ports for random connections (or something like that) and I added a wide range of ports in my user-defined protocol.  Much too wide a range.  When I finally got around to doing a netstat -an and saw all the ports my machine was listening on, it clued me in to the problem.

So I deleted that rule, and that protocol and now everything is working.

I think the server was just bogged down with too much darn listening.  Anyway, to answer your question, yes, now I can telnet to the server on the POP port and now my pop mail is flowing.

Thanks for your help.
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