Need help with a multiplayer issue

Please describe the issue you are having in as much detail as possible:
My brother started the server and was able to get in. I however when trying to play as well tried to connect and got an error and it said unable to connect. I would also appreciate getting some help launching a new server
Please provide any evidence or demonstrable content of the issue:

Hi, the first thing you can try is direct connecting with the IP and port. If that doesn’t work please redo your server following our guides available here.