So I have my server up and running, showing that everything's fine. However, when someone else tried to join it, they just couldn't. I was online the whole time, in another tab trying to give them a different ip that worked. Nothing did. The guy wasn't on a cracked account or anything, either. I have no idea what to do.
The ip is HypernovaAsriel.aternos.me, if you want to test it. If it helps any, the dyn ip is bear.aternos.org:47900
~ Asriel