Double Nat: Fritz Box 6660 Cable + Netgear R9000 as second Router, no ARC connection to Core

Roon Core Machine

Networking Gear & Setup Details

Failure from ROON:

“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“xxxx”,“router_external_ip”:null},
“natpmp_autoconfig”: {“server_ip”:“”,“found_natpmp”:true},
“upnp_autoconfig”: {“server_ip”:“”,“found_upnp”:true}
Netgear is set to exposed Host but I can not Connect.

Thanks for Help

Connected Audio Devices

Number of Tracks in Library

Description of Issue

The uPNP way is not working due to your setup with two routers.

The best solution is to have only one router setup as a true router with NAT and DHCP and the other setup as an access point. In your case the FritzBox would best be the router. Then the FritzBox should find your Roon Core connected to your NetGear.