This problem is new and confusing to me. I'm using a desktop that is about 3 years old(custom built). It's using a nforce 7 series motherboard drivers(if that's important for the network adapter). I previously used XP on this system, never had any problems. I upgraded to 7 64x in July, also had no problems until today. I am at my college, using their internet which requires a log in through their resent system in the web browser. Never had problems with it. Today I'm spending countless hours making particles for a video game on the Source engine, and all of a sudden the editor crashes. It crashed because I lost connection to not only the work server, but my internet in general. Keep in mind I'm networked via a cable to the wall, so I have NO ACCESS to any router or hub. So my other devices still work via wireless, and I can still use my netbook when it is connected to the ethernet cord, so it's neither the cord or the port it's plugged into. That narrows the problem down to my desktop in some way. So here's where the problem is explained. As mentioned, I lost connection spontaneously. At first I hovered over my network connections icon, and I was shown that I was connected to public network 3 and public network 4 both with no internet access. Normally I am only connected to one network, so I was a little lost there. Then I disabled my bonjour service after reading about it, and also my IPv6 which then gave me only one network to be connected to. Randomly, the connection went though, and packets were sent and received, but it didn't last long, and in the diagnostic it said something about unable to connect to service machine or DNS. Still couldn't reach the resnet login page on firefox/internet explorer. I tried restarting, unplugging, everything. Next I uninstalled my nforce drivers, reinstalled them, no luck. Tried a system restore to 4 days ago, no luck. I asked my friend who is supposed to know this kind of stuff, but he couldn't really help me there. When I first ran my IP config, I was given a 169.xxx.xxx.xxx, which is was told is bad. I did ipconfig /release, then ipconfig /renew. Eventually I received an IP along the lines of 137.140.140.155 and a subnet of 137.140.143.250, which was a step in the right place. But I still couldn't connect to anything. I tried the winsock thing too, nothing. I'm on the verge of losing my mind, and my school is absolute garbage, as they never responded to any of my queries about the blazing speeds of 28kbs and loss of our storage of the networked drives. If anybody could help, I would really appreciate it, I am simply lost at this point, and I don't have anyplace else to take my computer to try out if the internet works there.

Hi, After check this issue, I would like to ask the following details: 1. Can you ping the router or the external URL successfully? 2. Are other Internet applications, such as Windows Live Messenger able to access Internet? 3. Boot Windows 7 to Safe Mode with networking and see if it works. 4. I suspect it may be related to DNS, try the following command and tell us know the result: Ipconfig /flushdns If the issue persists, please also run “ipconfig /all” in an elevated command prompt and send us the output. Hope this helps. Thanks. Alex ZhaoPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

None of these things work. I have the exact same problem (just recently, on two Lenovo laptops, R61s) that we have been using all over our organization (we have about 100 of them with the exact same image on our domain). Two suddenly won't work on the Internet, but connect to the network and email just fine. Every now and then, they will connect and then lose the connection. There is NOTHING in the event logs. I've tried everything . . . from the above-mentioned solution to others i've found out there (including the whole Bonjour thing, and the weird services key--I had neither), but all to no avail. Clearly this is an issue that Microsoft needs to fix as it seems to afflict folks with Win7 on multiple/various hardware, home and on domains. It's a huge PITA. A solution would be most welcomed.