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try this link : <a href="http://support.microsoft.com/kb/841561" rel="ugc nofollow">http://support.microsoft.com/kb/841561</a>
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try this link : http://support.microsoft.com/kb/841561 [http://support.microsoft.com/kb/841561]

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If the above link didn't help.<br />
<br />
Try to use the FE<br />
Run Exchange best practice analyzer tool, I had similar problem but on the FE and it was permissions and EPA pointed it out.<br />
<br />
MG.
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If the above link didn't help.

Try to use the FE
Run Exchange best practice analyzer tool, I had similar problem but on the FE and it was permissions and EPA pointed it out.

MG.

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Thanks for the suggestions, I will try them out and report back.
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Thanks for the suggestions, I will try them out and report back.

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New to supporting a client who has two Front End servers and three Back End. &nbsp;Users on two of the BE servers are working fine, but users on one of BE servers can't login to OWA. &nbsp;The prompt comes up, they put in their credentials and then receive the HTTP 500 error. &nbsp;All the boxes are Windows 2003 SP2 and Exchange 2003 SP2. &nbsp;On the affected box I can't browse to the default website or to the exchange website. &nbsp;I have restarted IIS, still no go. &nbsp;Any ideas???
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New to supporting a client who has two Front End servers and three Back End.  Users on two of the BE servers are working fine, but users on one of BE servers can't login to OWA.  The prompt comes up, they put in their credentials and then receive the HTTP 500 error.  All the boxes are Windows 2003 SP2 and Exchange 2003 SP2.  On the affected box I can't browse to the default website or to the exchange website.  I have restarted IIS, still no go.  Any ideas???

HTTP 500 Error trying to login to OWA

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.