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Fix 1: Use the Home or Work Profile (Windows Vista/7 only)
Windows Vista and 7 sometimes shows a dialog when you've connected to a party that lets you select the network profile to apply to the party network. It's important that you do not select the Public profile since that will cause the Windows Firewall to block the game's discovery packets, which means the game won't be able to find any game servers.
If you want to double-check that you're using the correct network profile, do the following:
Open Network and Sharing Center via the network icon in the tray area, or go to Start->Control Panel->Network and Sharing Center.
Find the Evolve Gaming Connection and verify that it says 'Home network' or 'Work network' below it.
If it doesn't, click the 'Public network' link and change the profile to Home.
Fix 2: Firewalls
If you're either using the built-in Windows Firewall, or you're running a custom one, such as McAfee, ESET or Norton, make sure you've allowed the game through the firewall.
One way of determining if your firewall might be getting in the way of things is to try pinging the other members of a party:
Right-click a member in the party window and select "Ping..."
A command-prompt window shows up.
The ping window shows you the ping time between you and the other person. If the connection is working and no firewall is getting in the way, you should see a line like the following:
Reply from 10.184.81.2: bytes=32 time=4ms TTL=128
If, however, the other person has a firewall that blocks traffic on the party network adapter, you'll see this:
Request timed out.
In that case, the other person should look into allowing network traffic on the party network adapter.