><td>15001</td><td>TCP</td><td>Envoy outbound</td><td>No</td></tr><tr><td>15004</td><td>HTTP</td><td>Debug port</td><td>Yes</td></tr><tr><td>15006</td><td>TCP</td><td>Envoy inbound</td><td>No</td></tr><tr><td>15008</td><td>H2</td><td>HBONE mTLS tunnel port</td><td>No</td></tr><tr><td>15009</td><td>H2C</td><td>HBONE port for secure networks</td><td>No</td></tr><tr><td>15020</td><td>HTTP</td><td>Merged Prometheus telemetry from Istio agent, Envoy, and application</td><td>No</td></tr><tr><td>15021</td><td>HTTP