Starting a website got this error.

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It means that Authentication level in IIS is not the right one .

It also means that probably you didn’t add all the needed features to IIS.

go to :

Start –> Control Panel –> Programs –>

Turn windows features on or off –>

Internet Information Services –> World Wide Web Services –> Security –>

Now you choose 3 new options  :

Basic , Digest and Windows Authentication .

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Start –> run –> inetmgr –> Default web site –> features view –> authentication –> double click –> you can see the features you installed –> enable Windows Authentication .

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That will resolve the problem.