Why does the IIS_IUSRS user need read permission on the ApplicationHost.config file in my Exchange 2010 OWA environment?

Posted by CrabbyAdmin on Server Fault See other posts from Server Fault or by CrabbyAdmin
Published on 2012-07-10T00:00:17Z Indexed on 2012/07/10 3:17 UTC
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Previously I was experiencing issues where users in my Exchange 2010 environment would periodically receive an error stating:

The custom error module does not recognize this error.

However, following the advice of a thread I read somewhere, I granted the computername\IIS_IUSRS user Read permissions on the ApplicationHost.config file in the OWA environment. After making this change, the problem has not yet resurfaced.

However, I'm not satisfied to simply settle for the fix, I'd like to understand why it worked.

So can somebody please tell me why does this user need read permissions on this file and why would that have resolved the issue?

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