On 3 systems in the last 2 weeks HTTP has stop working completely. When you try to open a HTTP website the standard 'page cannot be displayed' message is displayed, yet HTTPS and FTP sites, and all other network services work as normal.
The 3 computers are at 3 different physical locations, two of them are connected via a linux gateway/proxy, and the third is a home computer connected directly to an ADSL modem via ethernet. One of them has been in place for at least 2 years, one a few months, and the other stopped working less than a week after a reinstall of windows.
Each of the systems is using a different ISP.
They are all XP Pro, one with SP2 and the others with SP3.
I have tried IE6, IE7, and firefox and they all do the same thing.
All systems have AVG Network edition installed
I have tried logging in to a different user account, resetting winsock, reinstalling TCP/IP, running sfc /scannow, manually setting the MTU to 1500 in the registry, running WinsockFix, WinsockxpFix, LSPFix, CCleaner, Spybot S&D, Malwarebytes AntiMalware, a full AVG scan, disabling all firewalls and antivirus, and replacing the network card with a different make/model.
I have run:
netsh int ip reset reset.log
netsh winsock reset catalog
at the command line.
None of this made any difference.
Other computers using the same internet connection/modem and proxy where available are all working.
From the effected systems you can ping www.google.com
, and telnet to it on port 80 successfully.
The only solution I have found is to reinstall windows, though I really need another option.
Any suggestions are very much appreciated.