1.  First, check the agent log for a reason.

      On Windows, the log path for the agent is: C:\Program Files (x86)\Cloudmon\logs.

      On Linux, the log path for the agent is: /var/log/cloudmon/agent/agent.log.

2.  Verify if the CC_URL is in the following format: https://<controller IP>. If not, modify it to the given format and restart the cloudmon-agent.

      To restart the agent on Windows, navigate to Task Manager, go to the "Services" tab, find "cloudmon-agent," right-click on it, and select "Restart."

      To restart the agent on Linux, use the command "service cloudmon-agent restart."

3. Check if the controller is reachable from the agent machine.

4.  Verify if the firewall is blocking port 80 and 443