livestreamcast_edge doesn't work

i have downloaded livestreamcast1_0.zip and deployed the livestreamcast_edge and livestreamcast_origin in my two FMS 4.0 servers. the topo is look like this:

encoder ------>   livestreamcast_origin (192.168.1.2)  ---------> livestreamcast_edge(192.168.1.3) -----> client

then i made a change to host.ini

#{server group name} {primaryIP;secondaryIP} {upstream app name}

serverGroup1 192.168.1.2 livestreamcast_origin

then i publish a livestream to my livestreamcast_origin and the stream name is mp4:sample.f4v. then i use strobe media playback to connect to the livestreamcast_origin FMS Server to view the live video, evething is OK; then i change the src to the livestreamcast_edge, the video doesn't appear. what is the problem ?