I tried to set up a network using LogMeIn Hamachi in order to play Minecraft multiplayer with my friends. However, when they connect to my network using it,it says there is a "Tunnel Problem" (shown by a little yellow triangle next to their computer's name). When I go into the details, it says it was unable to set up a VPN because I couldn't contact their router. Is there any way to fix this? Thanks in advance!