OWA generates an error when logging in

We have an OWA environment of Windows 2003 R2 SP2 and Exchange 2003 Sp2.  We use a front-end to back-end server configuration for OWA. We use SSL

The problem I am seeing is  a user goes to http:\\xx.xxxx.com\exchange and then gets redirected to https:\\owa.xxxx.com\exchange.  They type there username and password and then they receive the following page "The specified request cannot be executed from current Application Pool".

If the user hits refresh their OWA mailbox page then loads.
shawn_pattiAsked:
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shawn_pattiConnect With a Mentor Author Commented:
We moved to Forms based authentication and we no longer receive the error message.  this request can be closed thank you
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NoLimit99RBSCommented:
Sounds like a problem with IIS.

check this out: http://www.outsystems.net/DeveloperCommunity/ViewTopic.aspx?TopicId=1791
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shawn_pattiAuthor Commented:
I also should mention the http:\\xx.xxxx.com\exchange page resides on a different server. The user goes there first and is then redirected to the exchange server at https:\\owa.riso.com\exchange
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shawn_pattiAuthor Commented:
I tried that yesterday.  I applied the the DWORD to both my front-end and back-end registries but i still receive the error.  
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SembeeCommented:
Have you verified which server is generating the error?

Simon.
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shawn_pattiAuthor Commented:
That is a good question...I don't know if it the front-end or the back-end.  Is there a way to check?
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SembeeCommented:
There should be something in the web site logs (not the system logs) that shows the error.

Simon.
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shawn_pattiAuthor Commented:
I checked all the OWA virtual directories and they are all set to the ExchangeApplicationPool.  They only one which was not was the "Default Site".  I set the Default Site to ExchangeApplicationPool and I no longer get The specified request cannot be executed from current Application Pool message after a user log in.

However now I receive HTTP 1.1/500 server error when users log into OWA.  If the user hit reload after getting that message the maibox then loads up.  Same symptoms different error now.  
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shawn_pattiAuthor Commented:
I looked at the site logs....there is alot of data there.  Is there something in particular i should be looking for
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SembeeCommented:
You are looking for the error code to confirm which server is generating the message.
You may also get something more from Internet Explorer by disabling show friendly http error messages.

Simon.
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shawn_pattiAuthor Commented:
I searched the logs and i did not find anything.  the http 1.1/500 error is so generic I am having a hard time narrowing down the cause.
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SembeeCommented:
Did you try disabling show friendly http error messages to see if anything more helpful was shown?

Simon.
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