If we continue following the OSI Model the next steps in diagnosing network issues in Vista is the TCP layer and application layer filtering. What does that mean? It means we should check our firewalls to make sure we can pass through. Firewalls could exist in Vista or on the outside network, or you could have a firewall installed automatically by your anti virus program or another third party application such as zone alarm could be the problem. The firewall filters incoming and outgoing connections. To check your Vista firewall settings do the following:
Click Start and then click Control Panel. Next, click Windows Firewall. You should now see a screen like the one illustrated below.
Notice in the diagram that the firewall is on and blocking all incoming connections that do not have an exception. We can also see from the diagram that we will be notified if a program gets blocked. Make sure your exceptions are set by clicking Change Settings and then clicking the exceptions tab.
If you are having issues accessing computers on your local area network (LAN) go into the network sharing center and enable File and Printer Sharing, Network Discovery, etc, as illustrated below.
That should solve any issues you have had with Vista networking.
Go back to Step 1 of how to troubleshoot networking issues in vista.
Go back to Step 2 of how to troubleshoot networking issues in vista.