You do not have permission to view requested page or directory using the credentials you supplied.
The request requires user authentication. According to appropriate RFCs, after first request to protected resource, the server returns the WWW-Authenticate header field containing an applicable challenge. The client may repeat the request with a suitable Authorization header field. The 401 response after request with included Authorization credentials indicates that authorization has been refused for those credentials. HTTP access authentication is explained in RFC 2617, HTTP Authentication: Basic and Digest Access Authentication.