@Joseph-TP 

No that is not my topology.  I do not have an ISP modem - my incoming fibre connection goes straight to the ax1500 router.  I had to do the following when I first got it
<quote>

• Go to Advanced > Network > IPTV/VLAN.

• Tick Enable IPTV/VLAN.

• Change the "Mode" to "New Zealand UFB".

  • If you don't see that option, select "Custom" and type 10 for the "Internet VLAN ID".

<end quote>

 

The VPN is nord VPN running on the PC.  I specifically said my samsung phone *can* always access the website via wifi through the ax1500 router - it does not seem to have this problem. There​​ are no settings on the PC that could cause this.  You didn't read what I wrote very carefully.  I said that changing a setting on the mediatek MT7902 wifi adapter made the websites work ​​again  - specifically I changed​​​ the "ARP offload for WOWLAN" to disabled and the websites started working - or back to enabled also makes it start working - most likely because  this resets something in the connection with the router not because the setting itself matters.  No-one else has this problem that I know of - the first two websites are highly regarded websites for the game of Bridge.  I didn't have this problem either until I got the ax1500 router a few weeks ago.  I have  Access Control, Parental Control, QoS etc all off.  Disabling the firewall in the router did not make any difference.

also ping always succeeds when I use the ping facility in the router itself on the diagnostics page.