Hi, I was trying to test TridentSDK server in general, but found some bugs with logging in, especially when I turned off compression-threshold, http://pastebin.com/NGp6sHeF
Just trying to help :)
Can I see your server.json file?
What was the memory allocated to trident?
Where did you get the jar?
here's the server.json
EDIT: screen shot of minecraft client error https://gyazo.com/2770732ee1ced9bafdc90909889e661b
Either way, you shouldn't be changing the compression threshold, Minecraft's handling of netty is less than satisfactory on many occasions.
I will look into this after the predicted release during December.