Error: 


Solution: 

Go to IIS -> Default Web Site -> Callisto_Server -> Authentication -> Try below:

  1. Enable both Basic Authentication & Windows Authentication -> try again to see whether the error still exists.
  2. Enable only Basic Authentication -> try again to see whether the error is still there.
  3. Enable only Windows Authentication -> try & see whether the error pops up.
  4. Please make sure the rest are disabled (Authentications & Impersonation).