Authentication Issue with FileServer Tunnel URL

I am experiencing an issue with the FileServer tunnel. When I start the tunnel and open the provided URL, I am prompted for authentication. However, I have tried every possible combination of credentials, and I am unable to log in.

Could you please clarify which login information is required for this authentication? For context, I have not created any specific user with permissions for the FileServer and am attempting to access it without such a setup.

Thank you for your assistance.