Applications and games communicate through ports (separate channels that can be managed in firewalls)
Email uses 25 and 110 commonly, FTP uses 21, Filemaker uses 5003.
Opening a single port in the firewall will allow the application to communicate over the network.
If access from outside a single router is required, Port Forwarding is required http://portforward.com
Thanks. I will pass this along to the network administrator. I had thought the port 5003 channel was for access from outside the local network. Good to know it applies to intra net as well.
If you are not accessing filemaker outside the local network then openning port 5003 is not required. You can just add the app to the list of allowed apps. You didn't stated what firewall your client is using, but if they are using windows 8 firewall then just enter firewall into the search then click settings , then click allow app through windows firewall, then add filemaker.