Error: Activation Failed - Protocol Error

This error typically occurs when you use Deep Security Manager to attempt to activate an agent and the manager is unable to communicate with the agent. The communication directionality that the agent uses determines the method that you should use to troubleshoot this error. (See Agent-Manager communication .)

Agent-initiated communication

When the agent uses agent-initiated communication, you need to activate the agent from the agent computer. (See Activate an agent.)

When using Deep Security as a Service, agent-initiated communication is the recommended communication directionality.

Bidirectional communication

Use the following troubleshooting steps when the error occurs and the agent uses bidirectional communication:

  1. Ensure that the agent is installed on the computer and that the agent is running.
  2. Ensure that the ports are open between the manager and the agent. (See Port numbers and Firewall Rules.)