If your Nerf ArenaBlast server doesn't appear in the All Servers list you have a firewall and/or a router which is/are not configured right. You have to open UDP port 4444 and 4445 on your firewall and/or router to be able to set up a Nerf ArenaBlast server. You can shut down your firewall while you play Nerf ArenaBlast too, but I recommend opening the required ports on your firewall and/or router.
