Fill Add server form.
In the dropdown Transfer protocol select HTTPS.
In the field Host specify your onpremise host which is used for web.
In the dropdown Client choose Client Security option.
Submit it by pressing Add button
Move new added server up or move default Comodo server down or remove it with appropriate buttons in order to make your server has top priority.
Save section with button Save in right top corner
Apply profile directly to devices or to device groups / users / user groups.
Go to device Client Security - Advanced settings - General Settings - Updates - Proxy and Host Settings and verify that profile changes has been applied to device
Run updates manually and check that all update actions successfully held