I have a laptop running Windows XP SP2 in a network environment that is not blocking or filtering any content over port 80. For some reason, I can not get any data/access over port 80 through that laptop: I can't go any standard websites and I can't telnet to anything over port 80 (telnet google.com 80). All other ports, including that for SSL work perfectly fine, so I can access any secure websites running via port 443. I've run tcpview and some other applications to see if any application was running on port 80 and nothing is there. When I try opening internet explorer I can see IE trying to access the website's respective IP addresses over port 80 but nothing happens and eventually the load dies saying the page could not be found.
See below for notes/things I've tried doing. Any suggestions as to how I could try and proceed in troubleshooting this issue would be greatly appreciated
Notes:
1) Everything works fine when loading under Safe Mode
2) I've tried a selective startup with everthing disabled --- this did not help/work
3) Internet Explorer/Firefox are configured for auto-proxy (aka No Proxy Server)
4) Norton Internet Security is installed, and has been for over a year now. I've tried disabling this completed.
5) Cisco's VPN client may have been installed and then uninstalled around the time this problem occurred; I'm unsure. The application is no longer installed.
6) It appears that only port 80 is being restricted as DNS/SSL/ICMP protocols function perfectly.
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