401: Unauthorized

The 401 (Unauthorized) status code indicates that the authentication credentials received are not authorized. The user may repeat the request with a new or replaced Authorization header field.

Code	401
Description	Authentication Error.
Generic Cause	Unauthorized authentication token.
Quick Fix	Verify whether an authentication token is obtained and ensure to provide this with each request.

There are different types of Authentication errors and this section provides sample scenarios of authentication errors as well as tips on how to identify them.