I own quite a cool minecraft server but the command blocks are not enabled. I turned it to "true" in the server settings but it's still not working. This is extremely important because it makes sure that the players will not cheat in KitPvP, Survival, etc. Please answer.
I had this problem too with my minecraft server and what you have to do is make sure in the server.properties "enable command blocks" is set to true and then reset your server (turn it off and then on again).
Restart or Reload the server, and it should work. If it doesn't, look at the config file and see if you had a typo anywhere.
Another, more easy and reliable way to prevent cheaters is to install CombatLog and/or NoCheat+.