This is a common problem. If your servers aren't showing up, try turning off your firewall/antivirus. Temporarily turn off your firewall and you might be able to see them. If that works, then you can continue to play with your firewall off or allow GunZ to have access through your firewall. This can be done through your firewall settings, or you may have to edit your firewall settings through your antivirus if you antivirus controls your firewall settings.