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It's been a few days since I've been trying to log into my server with mods, but every time I try to log in I log in for a few seconds, I fall out of the server next, and the timeout message appears on the screen. Also if my friends are on the server and I join, they also fall off the server. It also happens that when players leave the server it doesn't close by itself, even though the timer has already reached 0, and even after the players leave it keeps showing that there's someone on the server, and my friends can't enter the server after they come out of it even though it is already open. What could be causing this? And how to fix it?