OWA stops responding after various periods of time

Outlook Web Access stops accepting connections a couple of times a day.  Everything works fine for a certain amount of time (can be as long as 24 hours or as short as 1 hour) then OWA stops accepting connections.  We have found that restarting the World Wide Web Publishing Service corrects the problem for another period of time.   Any ideas or directions that we can look at?
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Could you also create another virtual directory in IIS and put up a one page website? That way when the OWA web application stops responding we can test the other site to see if that is offline as well.

What is the EXACT error that you see when OWA stops responding to connections?
scottvinAuthor Commented:
I created another virtual dir and put up a one page website.  It just stopped responding and I got the error in the code snippet.  Cannot find server or DNS error.

 The page cannot be displayed 
The page you are looking for is currently unavailable. The Web site might be experiencing technical difficulties, or you may need to adjust your browser settings. 
Please try the following:
Click the  Refresh button, or try again later.
If you typed the page address in the Address bar, make sure that it is spelled correctly.
To check your connection settings, click the Tools menu, and then click Internet Options. On the Connections tab, click Settings. The settings should match those provided by your local area network (LAN) administrator or Internet service provider (ISP). 
See if your Internet connection settings are being detected. You can set Microsoft Windows to examine your network and automatically discover network connection settings (if your network administrator has enabled this setting). 
Click the Tools menu, and then click Internet Options. 
On the Connections tab, click LAN Settings. 
Select Automatically detect settings, and then click OK. 
Some sites require 128-bit connection security. Click the Help menu and then click About Internet Explorer to determine what strength security you have installed. 
If you are trying to reach a secure site, make sure your Security settings can support it. Click the Tools menu, and then click Internet Options. On the Advanced tab, scroll to the Security section and check settings for SSL 2.0, SSL 3.0, TLS 1.0, PCT 1.0. 
Click the  Back button to try another link. 
Cannot find server or DNS Error
Internet Explorer  

Open in new window

That is a pretty generic error message...

Can you look in the event log (Start -> Run -> "eventvwr") and tell me at the time the freezing happens, do any entries get recorded in any of the logs? This can be crucial to diagnosing the problem.
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scottvinAuthor Commented:
That is the problem - tere is nothing in the event log when this happens.
I checked the application pools and there is nothing that is stopped.

Do you know of any tools or traps that I can use?
scottvinAuthor Commented:
I don't know if this pertains to the issue at hand but this error seems to occur around the same time.  We do not have an IAS server.

Event Type:    Information
Event Source:    IAS
Event Category:    None
Event ID:    5050
Date:        11/14/2008
Time:        12:10:42 PM
User:        N/A
Computer:   SERVER
The description for Event ID ( 5050 ) in Source ( IAS ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: SERVER.DOMAIN.com, DOMAIN
Not sure, I would try those tracing tools mentioned in the first link.
scottvinAuthor Commented:
Does anyone have any other ideas?  I have tried running the tools and I have been unsuccessful in finding an answer.  This problem still exists and OWA crashes multiples times a day.

scottvinAuthor Commented:
I solved the problem myself.

As I stated - OWA was not causing a crash so there would be no crash logs.  What I dug up was the non paged memory was topping out and causing connections to be dropped thus causing OWA to fail.  I made some changes in non paged memory programs (notably I changed from SAV 10.1 to Symantec Endpoint Protection).  SAV 10.1 uses non paged memory when SEP uses paged memory.


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