User check Page not displaying for https sites

[John_Colfer]

Hi Community

Have a strange one for a customer. 

They use URL filtering/Application control. Its working as expected and blocking what it should. When you go to http sites that should be blocked you get this 

But when you go to its https equivalent you get this:

You can see in the logs that everything is working ok:

Its just the Blocked page doesnt display. Has anybody seen this before?

Fairly simple config (I replicated issue on test environment). Its 77.30 Gaia HFA 302.

Thanks in advance and let me know if more info is required.

Thanks

John