Cannot Access External http sites

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A client computer on our network is having a weird problem. The Pc
can access network resources on the local lan and internet using all
protocols except HTTP. nslookup, ftp, ping (icmp) etc all work
fine.

The PC can access our Intranet website via HTTP, but when trying to
pull up any web pages on the internet IE returns a 404 error and
Netscape gives and error saying the host actively refused the
connection. Again, DNS queries work fine and so does FTP.

Has anyone seen this?? It is quite baffling.

Windows xp services pack 2. Same issue with ie6, ie7 and netscape.
Have disabled personal firewall, anti virus (norton) with no luck.
Tried Wireless ( 3 different networks) and wired connection with same
issue. Seems after rebooting the PC can access the internet for a few
minutes, then the errors begin occurring.

Any suggestions/Advice
.



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