All ping requests timeout, computer says connected w/internet (because it is a liar)

tburke89 · Mar 26, 2013

I had a similiar issue to this with one of my clients machines at work today, but I started a new thread because this is a bit different. I have a network of wired computers at home, connected to a switch that goes to my router/modem. All of the computers are online, including my wireless devices. My gaming PC has been "offline" for a couple weeks now, and I have been too exhausted from work to fix it. I have thrown all my energy at this since I got home a few hours ago and I am beyond frustrated.

The computer says that it is connected, but all ping requests time out. DNS is working because it pulls a valid IP address for each site before all four requests time out. Same for when I try to ping my router, 100% loss. I have checked all of the network settings and everything is configured correctly. I have ran "ipconfig flushdns", "netsh int ip reset resetlog.txt", "netsh winsock reset" - all to no avail. When I do a tracert I can't even communicate with the modem, and it gets no where. For some reason Windows says that it is online and working without a hitch, which is infuriating. When I run a network diagnostic it says "no problems detected"... Really? I have changed the cat 5e cable running to the switch, and I have tried plugging the machine directly into the modem. I have also tried system restore, and running ccleaner, malwarebytes, superantispyware, and winsockfix.

I am able to connect to the internet in "safe mode with networking", and this computer is communicating with other computers on the network - just not the internet. I really, really don't want to have to reinstall Windows on this machine. I have so much data and games installed on here (1+tb) and I don't have any media large enough to back all of it up so that I can reinstall Windows.

Any help would be greatly appreciated, I really don't know what to do next.

getochkn · Mar 26, 2013

Well if it works in safe mode, but not in windows then it's not hardware which is good.

Have you tried removing the drivers from the device manage and let Windows reinstall it.

pauls3743 · Mar 26, 2013

I'm going to suggest rolling back your network drivers. Sometimes when the network drivers are updated they stop the network card from working properly.

john-b691 · Mar 26, 2013

I would be suspect of a firewall.

Try the very basics.

Use the arp command and delete all. Then ping the gateway. Then check the arp table again and see if you see a arp entry for the gateway. If you do which I strongly suspect it means you can talk to the gateway at a mac level but maybe not at higher levels.

Next if you use the router as the DNS try to change it to 4.2.2.2 or 8.8.8.8 and see if things resolve. If this still works NAT is working correctly if not its a little harder to say. The key thing this means is that UDP packets can pass but likely tcp is being blocked.

It would be very strange for it to be a stack relate setting causing this problem. Since it works in safe mode it is unlikely the router blocking it since your IP is the same.

All I can think of is a firewall issue causing this, could be some strange malware of some form of VPN tunnel that did not completely unload...rebooting normally fixes messed up vpn though.

Floris van Silfhout · Oct 20, 2013

I had a similar problem,
I was connected to the router and internet but trying to load a webpage was nearly impossible. Only after many refreshing a webpage (any) would load. Other connected devices to the router had no issues.
I tried reinstalling the wireless drivers, checked all the firewall settings (even tried without a firewall) but the problem was still there.

First ping on the router gave me a 75% lost and after trying a couple of times a 100% lost (request timed out) was all I got.

So I went to the router's webpage, with a different pc/smartphone, and found the maximum number of NAT sessions per host set at: 2048. Changed this value to its maximum (20480) and now pinging the router gives a 0% lost and an average pingtime of 0ms. The number of open sessions to my pc lies around the 3300, so I guess that was the problem.
Webpages load lightning fast again, as far as my connection allows...

Hope this helps anyone.

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All ping requests timeout, computer says connected w/internet (because it is a liar)

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