Players get kicked from the server. "java.io.IOException: An existing connection was forcibly closed by the remote host"

[18:03:39 INFO]: AnticPosition lost connection: TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}

It happens often and I can't figure why. Attached a full log and of my last run of it and the server configuration. As you can see in the config, it's NOT set to kick idle players "player-idle-timeout" is set to 0). It even does it to me when connecting to my own server sometimes.

In my own experience, it appears to happen most if the player alt+tabs away from the Minecraft window. So if a player on your server goes to do something else, they get kicked. Trying to figure out why this is.

On a side note, yes the server is a cracked server. I have a legit game but trying to start an uncracked server here in China would be a joke and nobody would play (tried it before). This has nothing to do with me being a jerk, and is mostly just the fact that it sucks being a gamer in a country that the software and internet industry has a bad relationship with (most game websites even go as far as to block Chinese IP addresses from visiting their sites...). I hope you'll understand my situation and that I won't just get a cold shoulder...