Windows 7 machines can't get network but XP can?

I've recently installed some windows 7 machines on our network and they don't seem to be getting valid network configs. It sees the correct DHCP info and DNS servers and you can ping the gateway and other computers on the same subnet but when you try to ping other subnets or out to Google it won't go.

You can see local computers on the same subnetwork and even view webpages on the server on the subnet but everything else network wise outside of the subnet doesn't work.

We have a subnet firewall and it is set to allow everything on the trust side out on any port to any computer. I've even made a rule that let everything in from the outside (untrust) on every port to these windows 7 machines and they still don't get an identifiable network.

My windows XP machines work perfectly though.

Has anyone else seen this?

This applies to Vista machines as well.

Not sure if this really applies to you or not but I just kinda ran into an similar issue. I have a Windows Media Server and an XP box along with the Win 7 box in a WORKGROUP. I was able to ping the Media Server and the XP box but couldn't connect to them through a share nor could I see their shares.

Did some searching and found out that my System Time was off by 1 month and 1 hour. Setting the time to the correct settings made it all work perfectly. The link said it was something to do with a new way of authentication or something like that. Can't remember that was a week or so ago.

Anyway....worth a try. Make sure all systems have the correct System Time.

Uninstall Bonjour service if it's installed. Check task manager for mdnsresponder.exe

If found, Google for effective and proper removal procedure.

After, whether Bonjour is involved here or not, reset the TCP/IP stack.

Copy and paste each line to an elevated command prompt, hitting enter after each.

ipconfig /flushdns
nbtstat -R
nbtstat -RR
netsh int reset all
netsh int ip reset
netsh winsock reset

If you still need further help, type "system information" into start menu search box. In the screen the opens, hit ctrl+s. Use Winrar on the saved file and attach the .rar to a post.

Those commands didn't help. I don't have the Bonjour service on any of the machines. System time is correct on all of them as well.

I'll get the system info up later.

How to Network Windows 7, Vista, and XP Computers

Pearson Education - How to Network Windows 7, Vista, and XP Computers