I am unable to play on my server, because I get an error ("Connection Lost: End of stream" in client)( http://pastebin.com/0amxGU6u in server) whenever I try to connect to my survival server after upgrading from 1.5.2 to 13w18c.
Also, I get "[SEVERE] Reached end of stream" in the server console every time my client tries to get the ping and connection (the refresh button in the server manager).
I am no expert at java, but I think it has to do with the "Empty String Not Allowed"
I can't say what it is, but one string is missing. I would like more details about the server.