I had been getting problems with authentication with any of my webresources.
The problem was driving me mad, I was looking at authentication in all areas of ISS manager and couldn’t see anything which should be causing the problem.
I finally found this forum post and I did this part and it resolved the issue.
actually it was wierd because first I tried this
For IIS Windows Authentication, remove Negotiate and just keep NTLM. See if you have any better luck.
It then worked but then I changed it back and it still worked???!?!?!?!?!
This was the instructions
go to IIS manager
– expand, server, go to sites
– select the CRM website
– in the feature view, select Authentication
– select windows authentication
– click on Providers, and add negotiate as second enabled provider after NTLM.
The only thing I think I have done is move NTLM so it’s the process that it first tries. Either way it is now working and I am going to slowly back away from IIS Manager and the configuration settings