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Can't say I'm much of a Windows expert, but this is somewhat of a weird occurence. I'm in front of a HP G61 Notebook laptop with Win7 that has connectivity problems. I mean that it's connected to the local network, Windows is absolutely convinced it can access the Internet, pinging arbitrary domains and IP addresses works, name resolution works too (and therefore must work UDP), but I can't connect to any website, or open MSN, or stuff like that. Even the Java Updater can't connect.

This is not a router issue, as other computers on the network can access the Internet. We also tried to join another wireless network, and found the same problems. Even with a wired connection, the same things happen.

My guess is that somehow, TCP is dead.

I've tried a bunch of things: restart the network adapter, reset the TCP/IP stack, reset WinSock too, but nothing works.

Any idea?

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the default gateway setting is correct ? –  Sathya Nov 27 '10 at 5:03
    
@Sathya Yes. It is the automatic gateway address obtained with DHCP. Besides, if it wasn't valid, I wouldn't be able to ping outside the LAN. –  zneak Nov 27 '10 at 12:26
    
Use IE to do a reset, its in the Tools>Internet Options>Advanced Tab, this resets more than the IE browser. –  Moab Nov 27 '10 at 15:27
    
@Moab I've already reset TCP/IP and WinSock doing netsh int ip reset and netsh winsock reset. This is not a computer I own, so I can't just test whatever gets suggested as I need a bit of traveling. :/ –  zneak Nov 27 '10 at 19:57
    
Is TCP really dead? At the command line, type telnet www.google.com 80 <Enter> GET / HTTP/1.0 <Enter> <Enter>. If you get some HTTP+HTML spew, then I would suspect your system's proxy configuration. If you don't, then I would suspect a firewall somewhere. –  ephemient Nov 27 '10 at 20:41
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