Our office has about 10 computers and 2 servers, all of them belong to the same domain. The 2 servers run Windows 2003 Enterprise & Standard, 1 is a domain controller. 2 of the workstations are running on Vista, it's been working flawlessly until today. (all i did was to deploy 2 new printers, that's it)2 Vista PCs have no internet, and can not see anything on the network. but the NIC resolves the domain, DNS & Gateway correctly. I can ping from the problem Vista pc to server and gateway(Cisco firewall) no problem and vice versa. All IP address are valid. I don't get it, it just doesn't work. In the Network & Sharing Center, the link is broken from the gateway to the internet, but there's a link from "This computer" to the domain controller(DNS server). but after about 2-3 minutes, the link comes back and shows there's internet, but it still doesn't work. We disabled TCP/IPv6 already on both Vista machines. I also moved the vista computers in Active Directory to a fresh OU called Vista. is this a Group Policy related problem? Since Win2k3 GPO doesn't work on Vistas.

This sounds hauntingly familiar to an issue I was having. I put up a note earlier today about what I did to fix it. The only thing that differentiates my case from yours is that after I rebooted the problem Vista it just wouldn't see any network adapters including wireless or dialup. Device manager said it was all there. Perhaps my note will help you. http://social.technet.microsoft.com/Forums/en-US/itprovistanetworking/thread/7975c312-d664-4f4e-9c10-4381cb64cb46 When in doubt defenstrate it

Hi, Thank you for your posts. Based on my research, I would like to suggest the following to check the issue: 1. Please put a new cleanly installed Windows Vista computer to the same network, and monitoring it for a while to see if the problem occurs. 2. Then, we can join this computer to domain and check again. Please let us know how it works. Thanks. Nicholas Li - MSFT