Documentation forServer & Application Monitor
Monitoring your applications and environment is a key capability of SolarWinds Observability Self-Hosted (formerly Hybrid Cloud Observability) and is available in the Essentials edition. Server & Application Monitor (SAM) is also available in a standalone module.

SolarWinds Platform server-Initiated (Passive) Communication

With passive communication, the agent waits for requests from the server on the default port of 17790. (This can be changed if needed.) This port must be opened on the agent computer's firewall so the server can connect. No change to the server firewall is required.