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ahSHENG-1064 asked BruceZhang-MSFT commented

IIS infinite Windows Authentication

I'm trying to set up windows authentication for my iis api. however , after enabling the windows authentication in iis, once my front end fire an api to the iis server , im getting infinite prompting of credential with any credential key in. i've tried various solution like disabling loopbackcheck , add to secure site . any help is appreciated.

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Hi @ahSHENG-1064 ,

Did you disable loop back check in the registry? After disabling, did you restart the machine?

You could try to set this code in web.config:

 <authentication mode="Windows" />
     <allow users="*" />
     <deny users="?" />

Make sure the NTLM is the first provider and the Extended Protection is set to Accept under Advanced Settings.

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