Vivian Aeon

I can confirm this is still in 1.13 pre7.

Hello, I run a server, and I'm having the same problem in version 1.12.2. As mentioned before, this seems to be due to a change in the protocol with the keep-alive packet. Some players on my server will get disconnected due to the java.io.IOException error a few seconds after connecting, and the problem persists if they continue to try logging in. This problem affected me as well, until I switched to using a VPN to connect to my server. I'm using windows 8, connecting using ethernet cable. When it isn't keeping players from logging on, it is drastically raising ping, ranging from a ~10ms average increase to ~100ms, which can spike up to 1000ms increase in ping at times... Incredible amounts of latency, although the server is hosted in a datacenter with a 100 mbps uplink connection.