C6 Protocol Version

[ban]

Client: [IP: ***.***.***.**] - Failed reading: [C] ProtocolVersion ; null java.nio.BufferUnderflowException
 
does this happen, when players enter with the wrong Patch?

https://pastebin.com/NWhJukNU

[G-hamsteR]

They are using the wrong client. You can specify your allowed protocol versions inside your configs.