In order to use custom ISOs, do the following:
1. First go to the Control Panel for the management of your server which is available at manage.webhorizon.net
2. You need to enable VNC in order to have graphical access to you server. Go to the Options tab and as shown bellow, click on Enable VNC Access.
3. After a while, the VNC button will appear on the top right corner. Click on it so that you can have access to your server.
4. Next you need to mount the custom ISO using its direct link. Click on the Media tab and then Custom CD/DVD.
5. Before going any further, you should change the boot order of the server such that it prioritizes the boot from the CD/DVD (custom ISO). For doing that, as shown bellow, choose CD/DVD and then click Apply.
6. Now you can enter the direct link of the custom ISO that we want to install and then click on the Insert button.
Note: The URL must be HTTPS but should not include the https:// prefix. It must also end in .iso and contain no re-directs.
If the link is valid, the image will be mounted as shown in the following screenshot.
7. At this stage you can Restart your server so that it boots from the custom ISO and ontinue with the installation process
