I am having a similar problem, except I have a conflict on port 443. I have successfully installed the console on one server with the settings below and it works great. On the second server I am having trouble getting the console to open. I don't get any errors on installation. I have gone through the basic troubleshooting. I also installed it onto a clean server for testing and can get connected with the defaults but not with my custom ports. Through the process of elimination I have narrowed it down to the console port 28080 (default 443). Any insight will be gratefully appreciated.
Edit:
I am upgrading Avast Endpoint Protection Suite to Avast Business A/V Pro Managed on all workstations and servers.
Port settings:
Destination location:
C:\Program Files\AVAST Software\Management Console
Additional tasks:
This will create an icon with shortcut to the management console
Create a desktop icon
Business Console:
HostName: server2016.mydomain.local
Port: 28080
Database:
Port: 28433
Data folder: C:\ProgramData\AVAST Software\Management Console
Ports for communication between Management Console and Antivirus:
Port: 28080
Port: 8090
Mike