Ports and protocols

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  1. Study matrix. Confirm every listener on the host you run.
  2. 443 TCP — HTTPS to a model API. Confirm the vendor host.
  3. 53 UDP/TCP — DNS.
  4. 4317 TCP — OTLP gRPC. OpenTelemetry default. Not re-fetched 2026-10-15.
  5. 4318 TCP — OTLP HTTP. OpenTelemetry default. Not re-fetched 2026-10-15.
  6. 11434 TCP — Ollama's published loopback default. Not re-fetched 2026-10-15.
  7. 5060 UDP/TCP — SIP, RFC 3261. Confirm the listener.
  8. 5061 TCP — SIP over TLS, commonly assigned. Confirm in the IANA registry.
  9. RTP — a range you configure, not one universal port.
  10. MCP stdio — no port. Remote MCP is HTTP on a port you choose.
  11. Sources: RFC 3261, OpenTelemetry OTLP spec, MCP specification 2025-06-18, Ollama docs, IANA service names.

Sources and go deeper