For assistance in planning for the firewall integration, see on the Microsoft website, which is part of the Azure Stack Hub Operator Documentation. The article lists the inbound and outbound ports and protocols that Azure Stack Hub requires.
Dell Technologies maintains a Deployment Worksheet that contains more extensive firewall rules. This worksheet is provided during the planning phase of a deployment project. For more information, contact the Project Manager who is assigned to your deployment.
The following Microsoft pages contain detailed scenarios for firewall integration and best-practice recommendations: