I have the same issue
ISP is Act Fibre
Roon core 2.0 on Mac Mini circa 2014 with latest MacOS
Router/modem is Orbi RBR750 with updated software.
Does not connect to RoonARC though settings page in UPnP shows the port correctly identified.
{
“connectivity”: {“status”:“NetworkTimeout”,“status_code”:998,“error”:“”},
“external_ip”: {“actual_external_ip”:“49.XXX.XXX.236”,“router_external_ip”:null},
“natpmp_autoconfig”: {“server_ip”:“192.168.1.1”,“found_natpmp”:true},
“upnp_autoconfig”: {“server_ip”:“192.168.1.1”,“found_upnp”:true,“error”:“<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/\” s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/\“><s:Body><s:Fault>s:ClientUPnPError<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">501ActionFailed</s:Fault></s:Body></s:Envelope>”}
}
Need to get this fixed please