@Colin1963 Have also tried a Deco X53-DSL with same results. I can access the TVT DVR via web browser on pc OK with Ethernet connection to Deco The TVT DVR is connect bt Cat6 to LAN1 port ob the Deco...

@David-TP Both IPv4 addresses do appear to be the same, but still no joy

Can not seem to get iPhone to connect through Deco X20-DSL to TVT DVR with follow port settings HTTP Port = 80 Device Port = 6036 RTSP = 554