I made a Minecraft server for my son (6) and I to play together. So far, everything is fine, except I can't turn off PvP. Under the server properties, I have it set to false, but he is still able to do damage to me. I have restarted the server several times, to no avail. We're using version 1.7.4. I have been able to OP myself and change some other settings, but this one is refusing to let me fix it.
Minecraft server properties
Laarn Fear
Did you save the settings when you turned off PvP? I really don't know what other reasons there may be. Try reinstalling the server as that may work.
Joe