The server is currently under attack and we have had to block large groups of IP addresses. Unfortunately, it's likely that your proxy has been caught by these blocks.
Forbidden
You don't have permission to access / on this server.
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Apache/2.0.55 (Unix) mod_ssl/2.0.55 OpenSSL/0.9.7a PHP/4.4.1 Server at www.vbulletin.com Port 80
what's wrong????????
Tell Internet Explorer to use HTTP 1.1 natively and through Proxy Servers and you can connect.