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Home > Success Center > Server & Application Monitor (SAM) > SAM 6.4 Administrator Guide > Monitor with Orion agents in SAM > Agent communication modes for SAM

Agent communication modes for SAM

Updated: 3-9-2017

Communication modes determine how the agent and the Orion server communicate. This is frequently influenced by where the computer you want to monitor is on your network.

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 polling engine 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.

Agent-initiated communication

All communication between your Orion server or additional polling engine and the agent is initiated by the agent, and your Orion server does not initiate communication with the agent. You do not need to have a direct route from the Orion server or additional polling engine to the host where the agent is installed. To use this communication method, ports 17778 and 17791 must be open on the Orion server firewall to receive information from the agent.

You cannot use agent-initiated communication through proxy using NTLM authentication if you install the agent on a Linux-based computer.

File:Success_Center/Reusable_content_-_InfoDev/SAM_Admin_Guide_Reuse/SAM-Admin-MT/0E0/030/agent_initiated_communication.png

This communication method is most useful when the agent is installed on a network separated from your Orion server by one or more NAT devices, and you have no easy way to connect the two.

This communication method is also known as an active agent. In active mode, there are no listening ports on the agent.

 
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