The server does not automatically run since half a year or thereabouts. The suggestion below doesn't work.
There are more shortcomings (no desktop-to-desktop file sharing; frequent problems when pairing the iOS device with a new Mac, or goiing back to the machine it had first synced to… and so forth).
On the positive side, the interface is lovely. And it works, provided the server is manually launched following each and every restart of the machine.
When enabled as a login item, the whole system preferences window pops up every time the computer is restarted.