Die ist auch da, steht ganz unten
By default, hbbs listens on 21115 (TCP), 21116 (TCP/UDP) and 21118 (TCP), hbbr listens on 21117 (TCP) and 21119 (TCP). Be sure to open these ports in the firewall. Please note that 21116 should be enabled both for TCP and UDP. 21115 is used for the NAT type test, 21116/UDP is used for the ID registration and heartbeat service, 21116/TCP is used for TCP hole punching and connection service, 21117 is used for the Relay services, and 21118 and 21119 are used to support web clients. If you do not need web client (21118, 21119) support, the corresponding ports can be disabled. TCP (21115, 21116, 21117, 21118, 21119) UDP (21116)
Im Packet-Capture kann ich eingehend auf der WAN Schnittstelle nur den Port 21116 finden.