Unknown error at random times.

my OS is CentOS
architecture is x86
and for the version of java I have more then one version installed, when i do the command java -version it shows a old version. the 3 version i have installed are:
jdk1.5.0_22 -- this is what shows when i do java -version
jre1.6.0_24 -- This is the version my CB is running on
tomcat5.5 -- This i dont know.
I do not use any wrappers
I am using CB 617

The command i use to start my CB is

Plugins: Residence,Permissions,ichat,Simple Save,dynmap,scrap bukkit, craftbukkituptodate, heroic death, plgsetspawn,whitelist, xwarp

Full Server Log:

the /50.23.30.168:38856 lost connection appears alot and the other error shows up once in a whilte maybe every hour or 2

 

Do you have any monitoring going on with your server (Hint, the answer is yes, as shown by your banner). Chances are the server monitoring your CB server is at 50.23.30.168

As for the other error, that normally happens if someone hits the red 'x' instead of disconnects. It can also happen if your server up and kills the network card - which is usually a result of bad hardware.

 

would the disconnecting make the server lag a bit? no one was logged in when that error happened what could cause that, since no one is on.