All requests getting HTTP Error 401.2 - Unauthorized response

Question

My MVC app has, until a few minutes ago, been working fine (with asp/net membership as part of the solution). However, without knowingly changing anything relevant every req

Answer 1

Option-1:

In applicationhost.config check if there is any entry as shown below. If there is any such entry change anonymousAuthetication enabled value from 'false' to 'true'.

Option-2:

If you are using visual studio, make sure that anonymousAuthentication is enabled.