References > Aliases > Server-initiated communication

Server-initiated communication

All communication between your Orion server or additional polling engine and the agent is initiated by the Orion server, and the agent does not initiate communication to your Orion server. You must have a direct route from the Orion server or additional poller to the host where the agent is installed. To use this communication method, port 17790 must be open on the firewall of the remote host to retrieve information from the agent.

This communication method is also known as a passive agent.

For more information on other communication modes, see Agent-initiated communication.