Adobe's third registered server port, used by the local Version Cue server in Creative Suite.
IANA registers 3703 to Adobe as adobeserver-3 with no published specification. In practice it was the port of the Version Cue server that shipped with Adobe Creative Suite — the local instance was reached at http://localhost:3703, while a remote Version Cue server used a different port. Version Cue was discontinued after CS5, so on a current machine a listener here is more likely to be an unrelated application than Adobe software.
Expose with care
Version Cue was a desktop-local asset service, never meant to face a network; if something answers here, identify it before allowing it through a firewall.
$ curl -sS -D - -o /dev/null http://TARGET:3703/Seen 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.