I've recently discovered that my server-host provides use with mysql. I was trying to set up all plugins that are able to connect to this database and thought I had basically figured it out. However when I attempted to reload the server I found this in my Console: 12.02 04:40:33 [Server] WARNING Protocol error. Ignoring packet - Socket closed I'm not sure what plugin cased it, or whats going on here... I saw no other errors or warnings listed in console. (Sorry it's only a very small clip. By the time I got to post on forums the console was overrun from chat)
You can open up the server.log file to find more info from before and afterwards. Might help us to figure it out.