Last Sunday my client was unable to login to the CRM and was showing below error :
HTTP Error 401 – Unauthorized Access is denied.
I checked and found this error is of claims based authentication or IFD.
It was working fine from past 90 days but i just followed the below Microsoft article and error was resolved.
Cause mentioned :
The Token-signing certificate and Token-Decrypting certificate in ADFS will automatically be renewed by the Auto Certificate Rollover feature because these certificates reach their expiration date.
Microsoft KB Article : Click Here
