Understanding server error 401

Please can you explain whats a "401" thanks.
suzie.

Here is a general explanation of server errors.

http://www.opus1.com/demo/server_errors.html

Specifically 401 errors usually mean you are unauthorized to view the page.

Here's a short list of the most common errors you'll see:

http://www.worldstart.com/guides/error.htm

Hope that helps. BTW, I edited your subject. We prefer the subjects for questions like this be descriptive of the question. Thanks.

Heres some more in depth info on http errors:

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

Sorry atno about the subject. i'll remember, thanks also for the links, and explanations.
Thanks to you too rtm.