IP Products: What ports need to be open for LQ / LQR to work across firewalls and external IP addresses?
Port-forwarding for LQ / LQR interfaces:
In order to facilitate connectivity to an LQ unit that is behind a firewall, certain ports need to be mapped from your firewall to the LQ device. This mapping will forward traffic received on those ports from the Internet directly to the LQ unit.
• All devices within a Link-Group must have connectivity to the Link-Master on TCP port 80. When linking devices over the Internet, make sure that this connectivity is stable. Internet connection to an LQ device requires special configuration within your firewall (port-forwarding).
• All the units use port 655 (TCP and UDP) for group connectivity and audio transmission.
See attached
Also see solution "How do I setup LQ linking over WANs / Internet with public IP addresses?"