Just in case someone still watches this, i'm copying my post from ftb forums: Hello! I've made a FTB Unleashed 1.1.6 server for me and my friends to play on but we've encountered a problem - my friend is unable to connect to the server. - He has the correct modpack version and correct mods disabled- I have forwarded the port(25565) to my ipv4 address(checked on 3 different sites, they all say it's open)- my IP is static(set through ipv4 properties)- I've given him the external IP- he has original minecraft so online mode is not an issue- I've allowed the port and java[Caution: Executable File] in the firewall, both outbound and inbound (can't allow ftbserver because it's .jar)- the "server_ip" in server.properties is empty - has no ip written there I can connect to the server and play normally. Also, when i open the serverstart.bat, it doesn't open the usual "minecraft server" window you get if you run ftbserver.jar. Only the cmd. PS: i've checked a lot of different topics and tried many different things, nothing seemed to work. Hope you can help me with this. Many thanks in advance!gago