I recently invited my friend to my minecraft server, but it seems he could not connect. Others can connect; it is professionally hosted. We tried many IP's, but he could not connect to any of them. It simply says 'Connecting to Server' and stays stuck on that until it crashes.
However, when using tekkit, he can connect to any server. We tried deleting his .minecraft folder and using force update, and even using my minecraft launcher, but it will not work! Thank you for any support in advance.