Document address invalid

You have accessed a W3 server and you get back a message "Document address invalid or access not authorized".

The server does not (originally for security reasons) distringuish between a document which does not exist, and one to which you are not allowed access. However, most server are public servers which allow access to anyone, so if you are following a bona fide link, this could mean

You have been passed a bad document address. If you are following a link, check with the author of the document which contained the link.
The document has been moved. Check with the server administrator. You should be able to find out who runs the server by going to the welcome page (g / with the line mdoe browser) and seeing a link to information about the maintainers.

If you are the server administrator, and you can't understand why the daemon refuses to deliver the file,

Check the rule file.
Try running the daemon with trace from a terminal session

Tim BL