Hacker on my server!!!!!!

so this guy called Solarflash9 is hacking my server! He's spamming chat like this:
Player Console unbanned Solarflash9
he can also control what other people say!!!
please help!

 

1. Stop the console.
2. Clear your ops.txt (delete it).

Now, did you download plugins from anywhere besides bukkit.org? What plugins do you have installed? Are any custom?

 

i did everything you told me, and i have not downloaded plugins anywhere else from bukkit i have: worldguard, worldedit, signedit, signcolorz, Ptweaks, Plotme, PEX, NoCheatPlus, multiverse, mobarena, mcore, MCMA_compat, LWC, Factions, Essentials, DisguiseCraft, CoreProtect, Chatmanager and Buycraft.

 

Try To just ban his IP idk what to tell u

 

I have found the problem, someone must have put an infinite redstone repeter thing to a commmand block, when i disabled command blocks it stopped, but I need command blocks for my server. How can i find this particulat command block that was spamming the chat?

 

idk just tp to random people maybe u will find it idk?

 

...

 

Use a third party plugin for Command Blocks. They're much safer that way.

 

Like what plugin?