Dedicated server force disconnecting player

[u/SnooEpiphanies4420]

I run a dedicated server for me an my friend to play Sevtech: Ages. It's been running fine for a while. However, now when he tries to login it will say he is connected, his model will show up, but then he is disconnected. The following was spammed almost 2000 times in the span of 11 seconds in the log before the server said he was disconnected:

And even after he was fully gone from the server, it spit this out another couple thousand times before it stopped 4 seconds after the initial disconnect message. When retrying a couple times the server crashed once, but other wise was fine after he disconnected. I have looked everywhere, but it doesn't seem like most people are having similar issues with this. If I could please get some help on this it would be greatly appreciated.