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Likely a username or password given was not valid. In essence the web server could not verify you are the correct individual.
Some web servers provide additional information and/or a secondary error number. For example, 401.1. If this occurs, check the Internet solutions list for for a better explanation and solution.
401 - Unauthorized: Access is denied due to invalid credentials.
You do not have permission to view this directory or page using the credentials that you supplied.
This server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials (e.g., bad password), or your browser doesn't understand how to supply the credentials required.
Web Server at ...
Error messages will differ depending on the web server and if replaced by the web site designers.
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
Use Correct Information
Enter a correct username and password. Remember that most passwords are case-senstive.
FaultWire Staff Posted: 8-Oct-2008
A very old browser might cause this issue. If you are using a old browser consider an upgrade to something current to fix this. Old browsers are also a major security concern.
The request requires user authentication. The response MUST include a WWW-Authenticate header field containing a challenge applicable to the requested resource. The client MAY repeat the request with a suitable Authorization header field . If the request already included Authorization credentials, then the 401 response indicates that authorization has been refused for those credentials. If the 401 response contains the same challenge as the prior response, and the user agent has already attempted authentication at least once, then the user SHOULD be presented the entity that was given in the response, since that entity might include relevant diagnostic information. HTTP access authentication is explained in "HTTP Authentication: Basic and Digest Access Authentication".
"401 Unauthorized" is supported by most Web Servers.
The four hundred series of errors indicate something was sent to the remote web server incorrectly.
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