Philip Abernethy

Same issue on a Linux x86_64 server (16 GB RAM, Java 7, Update 40)
2 clients, one Linux via LAN, one Windows via Internet, exception and several [SEVERE] Reached end of stream messages appearing for the windows machine mostly. But also for the LAN client a couple of times.

2013-08-10 22:23:45 [SEVERE] Reached end of stream for /<Windows client IP>
java.net.SocketException: Socket closed
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:121)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
        at org.bouncycastle.crypto.io.CipherOutputStream.write(Unknown Source)
        at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
        at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
        at java.io.DataOutputStream.flush(DataOutputStream.java:123)
        at cp.run(SourceFile:121)

I don't suspect connection problems, as the ping time was around 40ms from the internet client and the Mumble connection worked fine. Also the server is connected with a 50M/5M (Up/Down) connection and the client with a 16M/1M connection.

java was started with

java -Xmx2048M -Xms512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=1 -XX:+AggressiveOpts -jar /srv/minecraft/minecraft_server.jar nogui

Speed tests on both sides showed that the connections were gerenally good and keeping up to their advertised speeds.