Update: This issue is now fixed, https://github.com/agnat/node_mdns/issues/70.
I'm also getting an error with Node.js, ZeroConf and the Pi. Again, it also works on my development machine, but not on the Pi. Which sort of rules out a network or code problems on my end of things,
node_modules/mdns/lib/advertisement.js:56
dns_sd.DNSServiceRegister(self.serviceRef, flags, ifaceIdx, name,
^
Error: dns service error: unknown
at new Advertisement (node_modules/mdns/lib/advertisement.js:56:10)
at Object.create [as createAdvertisement] (node_modules/mdns/lib/advertisement.js:64:10)
at /home/pi/steward/steward/core/server.js:105:10
at Server.onListen (node_modules/portfinder/lib/portfinder.js:48:5)
at Server.g (events.js:175:14)
at Server.EventEmitter.emit (events.js:92:17)
at net.js:1035:10
at process._tickCallback (node.js:415:13)
Suggestions welcome...