I recently decided to port forward and create a Minecraft server for me and my friends. I downloaded the server.jar file into its own folder and got into my router settings online using my default gateway, and started to set everything up. I even found a YouTube tutorial that tells me exactly what I need to enter, however, upon doing so, I'm met with an extremely vague "Input Errors". I've tried to look around, but it doesn't work no matter what I do.
There is one thing. I was looking through the ports already present, and there seems to already be one with the "25565" port linked to my dad's old desktop, which is now my brother's computer. Would that be interfering? Should I disable it? Can I?