Load Test Controller - 3211: Could not connect agent control service

Possible Cause Resolution
The agent control service is not running. Start the agent control service.
A port mismatch occurs (the port that the agent control service is listening to and the port at which the controller wants to connect the agent control service are different). Adjust the agent connection settings.
The agent is connected through a proxy and the proxy is down. Check the agent connection settings and restart the proxy.