Port 9090 supports Prometheus and websm (UDP reference coverage) across distinct transports. Review each protocol before writing firewall or monitoring policy.
Common Prometheus server web UI and HTTP API endpoint.
Prometheus endpoints in environments where this service is explicitly configured.
Client to server
Place behind authentication and TLS and prevent unauthorised queries, configuration access, and administrative actions.
websm (UDP reference coverage) is documented as a network service convention for port 9090 over UDP.
Use this reference entry when identifying or validating systems documented to use 9090/UDP.
Varies
Confirm the listening process and current vendor documentation before permitting traffic; a listed convention does not prove the active service or its security posture.