ArcGIS Enterprise/Server - Custom 403 page

[MortenOlesen1]

I would like to be able to customize the 403 page the user sees when they try to access the service path and the Services Directory has been disabled. 

I would like to insert our organisation's own 403 page if possible, a link to our organisation, logo, etc.

This is what it currently looks like: 

Thanks, 

Morten