NETGEAR Orbi 850 Series mesh port forwarding is not working

The checks in more detail

The device's address must not change, so first reserve it in Advanced Setup, LAN Setup, Address Reservation, so that it keeps the same address after a restart. If the forward is in place and the test fails, check for a second router in front of the Orbi. A modem supplied by your provider that also routes will block incoming traffic before it reaches the Orbi; this is double NAT, and the fix is to put the modem into bridge mode or to forward the port from the modem to the Orbi's address as well. Check the router's WAN address on the status page: if it is a private address such as one beginning 10.

or 192.168 or in the 100.64 range, the provider is using carrier-grade NAT and no port forward will work from outside, so ask for a public address or use another method, such as a VPN or a relay service. Then check the device. Its own firewall must allow the port, and the application must be listening on it. Use a port check website from outside your network, or a phone on mobile data, to test. Do not test from inside the home, since many routers do not loop back. Make sure the external port you chose is not used by the router's own remote management. Update the Orbi's firmware, then restart.

A forward that worked and stopped may be a changed address on the device or the provider changing your public address, so use dynamic DNS. Open only the ports you need and keep the application up to date, since an open port is an invitation. Contact Netgear if the router will not save the rule, with the serial number. The Orbi 850 is a Wi-Fi 6E tri-band set, and a rule saved on it applies to devices on the main router and on satellites alike. Check that the device you are forwarding to is connected to this mesh and not to a separate access point, since a device behind another router needs a rule there too.