When connected to my Plusnet router (Hub One) everything is fine until I connect to my work's Global Protect VPN client, which won't resolve.  I'm not using Wifi-Auto-Sync because I'd like ot be able to identify where i'm connected to in case I walk round the house and end up connected to the furthest point, so I have created a different named network for the powerline.

In my Plusnet hub's device manger there is no information about the powerline, it only seems to know that something with a 1 GB/s speed is connected to Port 4.

Any ideas what I need to check/change/test?