Hi there @Roon_2.0_ARC_Support, I have the same issue. I am running ROCK on an Intel NUC. UPnP turned on in the router (Orbi system). My error (I removed IP address information):
{
"connectivity": {"status":"NetworkError","status_code":504,"error":"error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined"},
"external_ip": {"actual_external_ip":"xxx","router_external_ip":null},
"natpmp_autoconfig": {"status":"NotFound"},
"upnp_autoconfig": {"server_ip":"xxx","found_upnp":true,"error":"Did not find UPnP service with WANIPConnection on network"}
}