What means 401 Unouthorised error?
Error 401 Unauthorized Server is issued in the case, if there are authorization problems.
Why is this happening?
This is due to the fact that the user gave an incorrect request. Typically these errors are related to the incorrect server settings.
How to fix it?
Initially the user should try to enter again the correct credentials login \ password. Once the problem remains and it does not help, you should keep the answer text ( you will need it while contacting your web hosting support) .
Further, we recommend that you contact your hosting provider support so they can determine exactly where the error occurs. The problems can be not only in the server, but also the code in the site. And in such case, you need to contact your developer .