Minecraft Forums

Hello, I have a problem I need help with. I created a Tekkit server and adjusted the mods that I wanted and didnt want. It all worked perfectly fine on my computer and I was able to host a server with the mods as well. My computer connects to it perfectly fine and everything works. My friend who I was gonna play with also did the same thing. They have the same mods installed and everything and single player works perfectly fine for them. The issue is when they click the Multiplayer button it just stays frozen. Nothing happens after that, to close it we need to open task manager so the good thing is that the computer itself doesnt freeze but the game does. Anyone have any ideas?