Firefly server running but won't show up on the Soundbridge.
Firefly is however showing up on PC and Mac running iTunes and songs play.
This usually indicates that your router is blocking multicasting.
Firefly uses multicast packets to advertise itself across the network.
Many newer routers prevent multicast packets from passing between the wired & wireless portions of your network.
In your router settings you need to look for something like "multicast", "IGMP", etc... and adjust the settings accordingly. Run a search on this forum to find more info.