I would be delighted to have a port checker in order to make sure the needed ports are opened between my different pollers or other key servers (AWE, SQL, NTA flow storage etc...)and my main server. A small tool like the permission checker, but applied to connectivity check could be usefull. If ports are blocked at the Windows Firewall level, it could, as a bonus, modify or guide to resolution.
I see that as an added value to install process, and whenever we have to make sure the system is healthy.