IIS Authentication Issue 403 - Forbidden: Access is denied.

I'm posting this in case it's useful and you're also having a mental block on a problem

If you see the following error in IIS you may assume that this is an authentication problem

IIS Authentication Issue 403 - Forbidden: Access is denied.


And then start making changes to Basic Authentication, Anonymous access etc

This issue can be caused by your SSL configuration
2016-10-03 10:03:02 10.0.0.4 GET /someurl - 80 - 95.138.200.166 Mozilla/5.0+(Windows+NT+10.0;+WOW64;+rv:49.0)+Gecko/20100101+Firefox/49.0 - 403 4 5 98

The key is to check the HTTP subcode, a subcode of 4 relates to SSL, in this case IIS is configured to require SSL, going to the web site using HTTPS:// will resolve the issue.


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