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The illustration shows a diagram of the agent and the OMS. A line representing the firewall appears between the agent and the OMS.
Two additional lines represent data being uploaded to the OMS and the OMS contacting the agent, respectively. Text in the diagram explains how you need to:
Configure the agent to use a proxy server to upload data to the OMS.
Open the agent port (usually 1830) in the firewall so the OMS can communicate with the agent.