I receive a 401 Unauthorized error when logging in?

The 401 Unauthorized error means your request to the server was not valid because it is missing a valid security token. In most cases, this happens when you attempt to post the same form multiple times. For example, this happens when you press the “Refresh” button in your browser after you have just tried to login.

You can resolve this issue by pressing the “Back” button in your browser to go back to the login screen.