Could anyone shed any light on what I'm seeing?
If I’m reading this correctly, this problem shows up with just the base system installed; that is, you’re not actually writing any code (you’re definitely not writing a hotspot helper app, because this is macOS, which doesn’t support NEHotspotHelper). If so, this seems like a bug to me, and I recommend that you file it as such.
Please post your bug number, just for the record.
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
Thanks for the reply.
I had a go at reproducing the issue on a few other Macs with no luck.
In order to close this thread off nicely, I have found my culprit.
It turns out that our IT department had helpfully installed Cisco's AnyConnect suite for me to use our VPN.
With the Cisco daemons running during the connection process the issue described above occurs.
If they're disabled all is well and the portal loads correctly.
Bug report averted :-)