Board Thread:ROBLOX help and discussion/@comment-31423488-20150406223915

It's on Wikipedia, Similar to 403 Forbidden, the authentication is required and has been failed to access to Roblox Client. The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource. See Basic access authentication and Digest access authentication. The URL will be: http://www.roblox.com/RobloxDefaultErrorPage.aspx?code=401 