Internet-Security.com TCP port 17777 details

SolarWinds Orion Platform: the SolarWinds Information Service (SWIS) commonly listens on TCP port 17777 as its Net.TCP endpoint for the Orion API/SDK, used by modules like NPM, NCM, and SAM and tools such as SWQL Studio for queries and inter-component communication.
In typical deployments, the primary Orion server and additional pollers communicate over 17777 to exchange monitoring and configuration data via SWIS.
Security note: The SolarWinds Orion platform has been targeted in high-profile attacks (e.g., the SUNBURST supply-chain compromise) and has had API-related vulnerabilities disclosed; while not specific to port 17777 alone, exposing SWIS externally can increase risk and is usually restricted to trusted internal hosts.

TCP 17777