Can't connect DNS error

[jem.rayfield@…]

Any ideas how to fix this -->

$ ps -ef | grep 4s-backend | grep -v grep

502 81460 1 0 0:00.00 ?? 0:00.00 4s-backend demo

$ 4s-query demo
4s-mdns.c:200 timed out waiting for mDNS response
4s-query.c:158 couldn't connect to “demo”
$

Cheers
Jem