| HTTP 400 - Bad Request (Request header too long) |
Microsoft Knowledge Base 2020943 / Check, if there is a space in the name of the registry key |
| HTTP 503 |
Check status of Application Pool and start it, if stopped |
|
Check, if password of Application Pool user is expired (Reset if necessary) |
No connection could be made because the target machine actively refused it 127.0.0.1:8888 |
Run and exit Fiddler |
| User cannot consent to web app requesting user impersonation as an app permission |
Change delegated permission Access the directory as the signed-in user to Sign in and read user profile for Windows Azure Active Directory application |