SharePoint 2007 Error with .NET Framework 3.5 SP1 – Update

It looks like the problem I was having with the SharePoint Farm after having .NET Framework 3.5 SP1 installed was caused by the new loopback security check feature.

To resolve my issue I had to disable the loopback checking for specific host headers.   I followed the instructions for method 2 found here and it resolved the issue in our QA environment.

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