Make sure the "Communication Protocol version" within Control-M Server matches what the Agent is. For example, I have Control-M/Server version 7 with 6.4 Agents >>> Communication Protocol should be 8
I solved this problem days ago. The thing was that i had not set the IP TO HOST NAME in the agent platform. The agent had the Authorized CTM Server parameter set with my new CTM Server, but as the agent wasn't able to communicate with the CTM server through the name, the issue the arise.
Thanks for the interest in helping me.