ARC dies outside WIFI range - No cellular access, just "Poor Connection" even at 100+ Mps over 4G

Roon Core Machine

Roon Core (2.0 build 1128) running on a Nucleus +(

Networking Gear & Setup Details

Askey TCG300 Modem
Lynksys WHW03v1

Connected Audio Devices

Number of Tracks in Library


Description of Issue

ARC does not work on cellular, even while the measured speeds both of my home network and cellular network are exceeding 100 Mbps in download and 12 Mbps in upload.

ARC reports “Poor connection”, or, alternatively, “Can’t connect to your Roon Core”.

However, at exactly the same time, Roon runs normally from all of my remotes.

I will add more details about my network setup regarding my Nucleus + running Roon Server.
You can forget about the Lynksys router, as the Nucleus is connected by Ethernet to the Askey TCG300.
You may be interested in seeing some information on the Askey configuration, including ports. I am enclosing the files

More: Nucleus in the network: