impossible to play on my server 

What I expected to happen was...:

playing to minecraft 

What actually happened was...:
Describe what happened here

having an error (internal exception: java.net.socketexception: connectionreset, or another error) 

loging to the server and cannot do anything 

loging to the server having serveral lags while my connection is very good 

loging to the server without any blocks, falling to the darkness, only seing the sun and the moon 

Steps to Reproduce:
1. i don't know
2. ...
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