2 entries are registered on port 903. It is a well-known port (0–1023) — assignments here are IANA's, and a service found on one is usually the service that was assigned it.
services registered on this number
2 transports in use
entries encrypted on the wire
1 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :903 | VMware Remote Console | TCP | Remote Access | caution | 6.3k |
| :903 | Ideafarm Telnet Panic Door | TCPUDP | Remote Access | safe | 0 |
VMware Remote Console (VMRC) enables users to remotely access and manage virtual machines hosted on VMware infrastructure, providing full console access with mouse and keyboard control for administration and troubleshooting purposes.
port 903 as VMware Remote Console →Self-documenting Telnet Panic Door service assigned to Ideafarm on TCP and UDP port 903.
port 903 as Ideafarm Telnet Panic Door →The registry says what 903 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.
ss -ltnp | grep ':903\b'lsof -nP -iTCP:903 -sTCP:LISTENnetstat -ano | findstr :903On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 2 entries above.
A port number is not a service. Anything may listen on 903 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.
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