The Mudcat Café TM
Thread #133108   Message #3016873
Posted By: Simon G
27-Oct-10 - 12:30 PM
Thread Name: Tech: 'proxy server is refusing connections'
Subject: RE: Tech: 'proxy server is refusing connections'
It is unlikely to be the ISP if firefox and IE are behaving differently. It might be a virus checker on your computer

Any of this of use

http://support.mozilla.com/tiki-view_forum_thread.php?comments_parentId=76532&forumId=1