– install FileMaker server, see Read Me Document that accompanies server (tech note: FileMaker Server 7 Read Me)
in the “Exceptions” tab of Windows Firewall, add these ports
5003 TCP/UDP
50006 TCP
50003 TCP
Choose the Add Program option, then navigate to the Fmserver.exe file located in your FileMaker Server directory, then add Fmserver.exe as an exception to the firewall.
Note that this final step is required and is not contained within the FileMaker Read me document (it just says you have to unblock the program the first time it launches, but I have found that doing this alone does not work).