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In IIS 6, when you configure the applications to work with integrated windows authentication, sometimes you get the following error:

HTTP Error 401.1 Unauthorized Access is denied due to invalid credentials

In order to solve this issue, proceed with the following:

• run cmd
• go to: C:\Inetpub\Adminscripts
• Check if NtAuthenticationProviders metabase property is set to NTLM
• Type: “cscript adsutil.vbs get w3svc/NTAuthenticationProviders” & enter
• If you get the message: “The parameter “ntauthenticationproviders” is not set at this node.” proceed
• Type: cscript adsutil.vbs set w3svc/NTAuthenticationProviders “NTLM” & enter
• A sample from a machine – click for larger