@Sunshine Sorry, I did not get notified of your reply and I've only just stumbled on to it. The router I was using before was a Spark fibre router (DLink I think). So not a Deco and no SIM card. The...

I have just changed from another router to a Deco X80-5G. Everything (internet access, WiFi, etc.) works as expected, except I cannot access a webserver running on a PC machine on the LAN from my...