Execute server bat file which loads server, no issues found during the spawning of the map.
On client side load server and get to the Downloading Terrain screen and then it will error out with the following error:
internal exception io.netty.handler.timeout.readtimeoutexception
The client will then quit and the log from the server console will crash with the following crash log attached.
I have tried this using 3 different servers and 3 different clients and the problem is always the same.
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What happens if you edit server.properties and disable the watchdog?
max-tick-time=-1

so add that line into the server.properties and that will disable watchdog?

Adding this line, stops the server from crashing but the client still gets the "internal exception io.netty.handler.timeout.readtimeoutexception" error.
Tested again with 2 different clients

This is the server log after the watchdog disable command. It now no longer crashes but lags alot. Still unable to get a client to connect to it

This is the client log when the io.netty issue occurs, joining the server after the watch disable switch has been added.

Dupe of MC-63590

Yes same issue however server no longer crashes. Issue is that bug has been marked as resolved but the issue was still occurring even in that bug.
Worth creating new bug based on client issue?