See RSCM Server Port Usage for more information about which ports you need to unblock.
If you receive a Windows firewall message, choose the Unblock option from the following three options:
Unblock — Recommended. Selecting this option adds the port to the list of ports allowed through the Windows firewall.
Keep Blocking —Blocks the iCDBNetLauncher and may prevent the program from working.
Ask me Later — Blocks the port and then displays the Windows Firewall message and options again the next time the tool tries to run.