Part of twisted.cred View Source
| Class | Unauthorized | Standard unauthorized error. |
| Class | LoginFailed | The user's request to log in failed for some reason. |
| Class | UnauthorizedLogin | The user was not authorized to log in. |
| Class | UnhandledCredentials | A type of credentials were passed in with no knowledge of how to check |
| Class | LoginDenied | The realm rejected this login for some reason. |