Thanks for the ideas. Not sure what you mean by Network Topology but if it's structure, it's modem > archer c7 via ethernet. ISP is Start.ca. Here are two examples of pages that wouldn't load...

I spoke with Joy at TP Link on the phone - we tried the following and it didn't work: - Using Google DNS as the DNS for the router (8.8.8.8, 8.8.4.4) - MAC Address Clone Neither of these worked.

Various sites are blocked by the router. I can connect to the sites if I plug directly into the modem, no problem or tethered to my phone so it's not a problem with the laptop/Mac settings. Tried...