Using FreeNAS as local network CA

Hello,

I am trying to use FreeNAS as CA for my local network to have a proper HTTPS support for local web services.

I firsly created an internal CA like this:
View attachment 26346   
I exported the CA certificate and add it to Firefox CAs.

Then a certificate for the FreeNAS web interface:
View attachment 26347
I selected it in FreeNAS "System/General/Certifcate".


Now when I use Firefox to go to "https://freenas.local" or "https://192.168.0.100" I get...

Using FreeNAS as local network CA