[WB19] testing ssl

Hi,

Testing my sites in IIS using ssl on localhost does not work anymore.
I had not noticed this, so I don't know why or when this has changed. Is it the Windows 10 migration or have the browsers become more strict?
I suspect the browsers.
Anyway I cannot get it to work with a self signed certificate anymore.
Does anyone know a way?
The standard self signed certificate tutorials on the web don't work anymore.
Do I need to buy a certificate for my local pc?

Regards,
Piet