I am implementing a hybrid hosted model for one of a client. Application servers would be withing clients environment and adobe would be hosting the message center and mta/inMail. Architecture is as below. As you can see in the below diagram, there are 4 on prem server( 2 web and 2 app). Want to know what services would be enabled/disabled in the web & app servers? And what ports ( apart from 80,443 and DB port) to open on both the servers+Load Balancer?