I've read the posts about link tester and I've tried all the suggestions. Link tester keeps telling me the host name is unknown. Yes I'm using a proxy. Yes I can access the web pages using IE6. Yes I have all the extensions enabled.

Does anybody have any NEW suggestions?

Also, there was a post which wasn't answered but I'd like to know if there is a way, without using a web server, to test the links in local html files.