Any Ideas .. player cant seem to stay connected to my server.

I have a guy on my server that cant stay connected.. and I get this error in the log just before he loses connections.

[TcpProtocolDecoder ExceptionCaught] /50.80.59.94:52077: java.io.IOException: An existing connection was forcibly closed by the remote host

Quote from MasterLex

does he lose the connection immediately or after a couple of minutes (or later?)
how many players are online at your server when this is going to happen?

[TcpProtocolDecoder ExceptionCaught] /50.80.59.94:52077: java.io.IOException: An existing connection was forcibly closed by the remote host
[TcpSessionHandler ChannelInactive] /50.80.59.94:52077

This is the code just before he starts getting the lost connection warning. It only affects him and it is usually within 5 to 7 minutes
The number of players varies from 3 to 5

then he times out.
2018/08/15 08:56 PM G.f
INFO: Ragnar timed out!

Fixed using a VPN as suggested by Red in another thread.