[asp.net-mvc] 401 Unauthorized: Access is denied due to invalid credentials

I had a similar issue today. For some reason, my GET request was fine, but PUT request was failing for my WCF WebHttp Service

Adding the following to the Web.config solved the issue

 <system.web>
  <authentication mode="Forms" />
 </system.web>

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401 Unauthorized: Access is denied due to invalid credentials