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Weird internet connection issue

post #1 of 8
Thread Starter 
Ok, last night I couldn't connect to the internet on my home PC. The setup is:
Cable modem into router, my PC wired into the router, laptop connects via wireless. The laptop is perfect, with both WAN & LAN access, and my iPod had no problem with WAN as well. My PC however, will communicate to the laptop via LAN, but cannot connect to anything via WAN. It can connect directly to the router/gateway. It can also successfully ping the DNS servers, and some external wesbite servers. However, no applications can access the internet (IE, Firefox, games, BOINC) - I can't figure it out. Apparently, I cannot uninstall the TCP/IP protocol which annoyed me. I have tried restarting the computer, switching router & modem off, forcing manual IP & DNS settings (in accordance with the router), putting my PC in the router's DMZ - none of which have worked. Software firewalls were disabled too (my router has NAT), so it can't be that.

Any other ideas?
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post #2 of 8
Quote:
Originally Posted by chemicalfan View Post
Ok, last night I couldn't connect to the internet on my home PC. The setup is:
Cable modem into router, my PC wired into the router, laptop connects via wireless. The laptop is perfect, with both WAN & LAN access, and my iPod had no problem with WAN as well. My PC however, will communicate to the laptop via LAN, but cannot connect to anything via WAN. It can connect directly to the router/gateway. It can also successfully ping the DNS servers, and some external wesbite servers. However, no applications can access the internet (IE, Firefox, games, BOINC) - I can't figure it out. Apparently, I cannot uninstall the TCP/IP protocol which annoyed me. I have tried restarting the computer, switching router & modem off, forcing manual IP & DNS settings (in accordance with the router), putting my PC in the router's DMZ - none of which have worked. Software firewalls were disabled too (my router has NAT), so it can't be that.

Any other ideas?
I ended up doing the same thing a couple months ago. Until I realized something or someone had disabled its Local Area Connection under network connections. I felt like an idiot.
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post #3 of 8
Thread Starter 
My PC's LAN is working fine, that's why I'm so confused!
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post #4 of 8
Try running the desktop direct to the modem, reboot the modem, and see if you can surf. This will let you know if the issue is PC or router related. If it's the router reset to factory defaults.
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post #5 of 8
Quote:
Originally Posted by chemicalfan View Post
Ok, last night I couldn't connect to the internet on my home PC. The setup is:
Cable modem into router, my PC wired into the router, laptop connects via wireless. The laptop is perfect, with both WAN & LAN access, and my iPod had no problem with WAN as well. My PC however, will communicate to the laptop via LAN, but cannot connect to anything via WAN. It can connect directly to the router/gateway. It can also successfully ping the DNS servers, and some external wesbite servers. However, no applications can access the internet (IE, Firefox, games, BOINC) - I can't figure it out. Apparently, I cannot uninstall the TCP/IP protocol which annoyed me. I have tried restarting the computer, switching router & modem off, forcing manual IP & DNS settings (in accordance with the router), putting my PC in the router's DMZ - none of which have worked. Software firewalls were disabled too (my router has NAT), so it can't be that.

Any other ideas?
Do you run ZoneAlarm as well? Currently there is a known issue with the latest MS Hotfix that disrupts internet connections for XP users.

Here is a link to the issue: http://download.zonealarm.com/bin/fr...cessIssue.html

If this is the case, I'd recommend lowering the Internet Zone from High to Medium and then the Internet will work fine again.
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post #6 of 8
Thread Starter 
I don't have zonealarm running as it was a resource hog, now the laptop isn't connecting. I can use nslookup to resolve hosts, so that means the DNS is good? Anyway, I haven't tried taking the router out of the equation, because I am currently connecting perfectly via my iPod!! Any more ideas??? It's driving me nuts!

Update: Removing ZoneAlarm from the laptop has restored connection (I'm posting from there now). However, even connecting the PC directly to the cable modem didn't allow connection - it refused to renew the IP address. I know the NIC works, as the LAN between PC & Laptop is fully functional. Damn internet, what's the issue!?!?!
Edited by chemicalfan - 7/10/08 at 12:32pm
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post #7 of 8
Quote:
Originally Posted by chemicalfan View Post
I don't have zonealarm running as it was a resource hog, now the laptop isn't connecting. I can use nslookup to resolve hosts, so that means the DNS is good? Anyway, I haven't tried taking the router out of the equation, because I am currently connecting perfectly via my iPod!! Any more ideas??? It's driving me nuts!

Update: Removing ZoneAlarm from the laptop has restored connection (I'm posting from there now). However, even connecting the PC directly to the cable modem didn't allow connection - it refused to renew the IP address. I know the NIC works, as the LAN between PC & Laptop is fully functional. Damn internet, what's the issue!?!?!
The TCP\\IP stack within windows is messed up and this is why requests for port 80 (http) are not being processed properly. This is a problem with windows and not the NIC. Try downloading and running "TCP Optimizer" and see if that helps. If this doesn't fix the issue you will have to reinstall windows.
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post #8 of 8
Thread Starter 
I managed to resolve this late last night! I had backed up all my stuff, ready for a format and re-install (I was going to take the opportunity to go to Vista64), but my last ditch attempt to fix it worked! I installed XP SP3 (which has failed on me many times before!) successfully, and with it regained internet access. The TCP/IP stack sounds about right, although at the time I was pointing my finger at the pair of DNS dll files - not sure why, but they seemed like a probably target due to lack of ability to resolve DNS addresses outside of nslookup.

Nevertheless, problem solved - thanks for your help guys!
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