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I am frog in a well. Every time I jump out of the well; I relialize I am in bigger well and eventually get bored which motivates me to get to next level.

WCF Services Failure with Exception message: The authentication scheme ‘“Negotiate’ is not supported.

Exception information:
Exception type: NotSupportedException
Exception message: The authentication scheme ‘“Negotiate’ is not supported.

Solution:
Open a prompt and type:

# cd c:\inetpub\AdminScripts
# cscript adsutil.vbs get w3svc/NTAuthenticationProviders

If you find you have something like “Negotiate,NTML” then type:
# cscript adsutil.vbs set w3svc/NTAuthenticationProviders
“Negotiate,NTLM”
or delete the key, since IIS6 has this value by default
# cscript adsutil.vbs delete w3svc/NTAuthenticationProviders

By the way, you should probably check it also on the specific WebSite
where the service is setup, example:
# cscript adsutil.vbs get w3svc/1/ROOT/NTAuthenticationProviders

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