FileMaker's client-server data port — FileMaker Pro and Go talk to FileMaker Server here.
Claris registered 5003 as fmpro-internal for FileMaker's proprietary transport, and it is the port FileMaker Pro and FileMaker Go use to open hosted databases on FileMaker Server. Claris documents it as required through the firewall alongside 80 and 443, and it is not configurable. A listener on 5003 means a FileMaker Server is hosting solutions for clients somewhere.
Expose with care
Claris's own deployment model puts this port in front of remote clients, so exposure is defensible — but only with a real TLS certificate installed on the server, strong account passwords, and the admin console (16000) kept off the public internet.
$ nc -vz TARGET 5003Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.