I apologize for the delay. The reason for this post was because I needed to find attacking IP's. They have continued and the server has hung many times as a result. So I've been busy blocking IP ranges and it seems to have stopped them, for now at least.
CSF is installed but I have port 3306 open so it can be accessed from a program I use locally. There are also a few clients on the server that need such access. Since my IP, and those of the clients, are not static, I'm assuming there's no way to prevent these messages since the port is open. Is that correct.