Posted by Joel
When deploying a webservice on a newly configured Windows Server 2003 using IIS 6, you may get FileNotFound exceptions when you attempt to access said webservice.
This is due to the fact that Windows Server 2003 is by default locked down pretty tight. The problem stems from the fact that ASP.NET webservices creates temporary dll's in the %windir%/temp directory, and unfortunately, if not configured correctly, the ASP.NET worker process may not have read/write permissions to that directory.
Luckily, the fix for this is rather simple, all you have to do is grant the ASP.NET account read/write access to that directory and you'll be on your way.
For more information on configuring ASP.NET runtime security, see Microsoft KBase article 317012
