OMA & OWA down

Every day at approximately 9:00am and 9:00pm OMA and OWA (Exchange 2003 SP1) would stop working.  After restart of Exchange server (Server 2003 SP2 32bit), they were working again until that time.  After uninstall of SEP antivirus, issue went away for at least 2 weeks.

The issue has returned today at 12:09pm, however SEP is still not currently installed.  Browsing to http://servername/oma and /owa returns "Internet Explorer cannot display the web page".  I have recreated the virtual directories per other posts and have verified ASP.net configured to 1.1.

No changes made by myself before it went down accept configuring MozPro backup, which did not seem to be related to the issue previously.

Can someone help me identify the cause and resolve the issue?
pcguy07Asked:
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Tiras25Commented:
is there anything in Application Log?  

I would also suspect an IP conflict.
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pcguy07Author Commented:
I did not see anything around that time (12:09pm) in the application log.
IP conflict internally or externally?
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Tiras25Commented:
Internally.

Are all the services up and running?  I would also look at the firewall logs at that specific times.  Could it be running some updates or something else?

Also, what NIC do you have.  I remember there a specific driver that may cause that same issue.

I know some SEP modules can block those services.  Make sure you completely uninstall it.
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lastlostlastCommented:
It might be due to Non Paged Pool memory going high.

You can check the HTTERR logs by going to "c:\windows\system32\logfiles" (shortcut - Start --->run---> logfiles)
Check a couple of most recent log files. If you see "connections_refused" being logged in then refer to http://support.microsoft.com/kb/934878 and it should fix the issue.

Let us know how it goes.
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Tiras25Commented:
That's a very good call!
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pcguy07Author Commented:
I do have "connections_refused" logs.  I followed the steps in the kb and it resolved the OWA issues, however OMA is still down for the iPhones.  I am getting the message: "Cannot Get Mail.  Server Error.  Contact your server addministrator."
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pcguy07Author Commented:
I spoke too soon, OWA is down again.  Frustrating!
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tcompCommented:
It sounds like the concurrent allowed connections for the webpage is maxing out perhaps. Also Try setting up recycling conditions on your OWA application pool in IIS.
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tcompCommented:
Also do you have group policy set for logon time restrictions, and/ or timed ACLs on your firewall?
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