Which port must be opened to allow secure, agent-initiated communication from Windows and Linux agents?

Which port must be opened to allow secure, agent-initiated communication from Windows and Linux agents?

• A. 17778
• B. 161
• C. 445
• D. 22

Answer: (A)

The key idea is how SolarWinds agents communicate with the Orion server. For secure, agent-initiated data transfer from both Windows and Linux agents, a dedicated port is used. That port is 17778. The agent opens an outbound TLS-encrypted connection to the server on this port, providing authentication and protecting the data in transit. Because the connection is initiated by the agent, firewall rules should allow outbound traffic from the agents to the server on this port, with responses allowed back. Other ports correspond to different services and don’t enable the required agent-initiated channel: 161 is for SNMP, 445 is for SMB/Windows file sharing, and 22 is for SSH.

The key idea is how SolarWinds agents communicate with the Orion server. For secure, agent-initiated data transfer from both Windows and Linux agents, a dedicated port is used. That port is 17778. The agent opens an outbound TLS-encrypted connection to the server on this port, providing authentication and protecting the data in transit. Because the connection is initiated by the agent, firewall rules should allow outbound traffic from the agents to the server on this port, with responses allowed back.

Other ports correspond to different services and don’t enable the required agent-initiated channel: 161 is for SNMP, 445 is for SMB/Windows file sharing, and 22 is for SSH.