HTTP Error 401.1 Accessing SharePoint from server
If you receive the following error message when you attempt to access your SharePoint site from the server itself,
"HTTP 401.1 – Unauthorized: Access is denied due to invalid credentials”
your environment most likely had Microsoft Security Update 957097 (MS08-068) installed.
You can refer to the KB article 896861 to resolve the issue. It is highly recommended you pick method 1 over method 2 when making this change in a production environment.
