Possibly wrong or incorrect filewall profile was selected during install
Firewall may be disabled or turned off (not usually a problem)
Local firewall should have built-in rules to allow incoming connections to ports assigned to Dashboard, Recorder, Storage Server and License Service.
Connection problems may be due to Remote Desktop misconfiguration and not firewall.
Try turning the firewall off temporarily to rule out connection blocking.
RecordTS v7 (and newer) do not interact with the session logon and authentication process. If users cannot connect, it is most likely related to an RDP connection issue.
Outer or perimeter firewall may be blocking traffic.
Any other firewalls may be blocking connections depending on where they are located in your network.
If problems still exist after disabling the local firewall, then it may be another outer firewall causing problems.
If the machine is located in a DMZ or similar network environment, then all firewalls need to be checked.