Although the 'End of Stream' error isn't a new issue, it seems recent changes in Minecraft 1.5 has made this error occur much more frequently. In an effort to diagnose and address this issue, I'd like to start a discussion on it and provide a list of questions for people to answer that will, hopefully, help point us to what the cause is. Please note: this discussion is ONLY for server issues! If your users are encountering the End of Stream error when connecting to your Bukkit server, please help us troubleshoot this problem by answering the following questions: General System information What operating system are you running the server on? Is it a 64 bit or 32 bit version of the OS? What version of Java are you running (java -version to find out)? How much RAM do you have on the system? What are the specs of the server’s CPU? What network card does the server have? What network card drivers is the server using? What firewall or other security software is running on the server? Is your server directly connected to your router or on a network? What is the network connection to your server? (1,5,10, 100 mbit .. etc?) Are you hosting on a VPS / Cloud or dedicated hardware? What is your hosting provider (if applicable) Minecraft Server Information What version of CraftBukkit are you running (output of /version in-game - please provide the full version string)? What plugins (and their versions) is your server running? How much RAM do you allocate to the server process? What is the launch line you use to start the server? Do you experience high CPU load or paging during the time of the EoS? How many users are actively using your server when you experience the errors? What are your users doing around the time the error occurs? How large is your map? Are there large redstone circuits or minecart tracks on your map? Are you seeing any “Cannot keep up” errors around the time of the EoS? (Or just post ~10 lines from the log around the event?) Do you still have these problems if you run your CraftBukkit server without plugins? Do you still have these problems if you run a Minecraft server without CraftBukkit? Please only respond to this thread with relevant information. Anything else will be deleted.