The Agent does not successfully register with the manager, or it appears to successfully register but any communication between the manager and agent fails.
You cannot Fetch configuration parameters from agent from within the CCS Console.
You cannot Ping the Agent from within the CCS Console.
It is possible the secret key stored in the CCS Manager database does not match the secret key stored with the Agent.
To check the Secret Key for an Agent against what is stored in the CCS Manager Database follow the instructions below.
These values should match.
If the values do not match Register the Agent to the CCS Manager.
If this does not fix the problem delete the Agent from the CCS Console and register again.