Multicast in amazon FMS server

Hi,
We have a problem with amazon FMS 4.0.3 server for enable muticast.
We have made this tutorial : http://help.adobe.com/en_US/FlashMediaServer/4.0_amazonec2/WSbb9528066c89be0e-605aa81e132a bbe8ee2-7ffb.html
In the server we have open all the port for ensure the good works.
but when we used the http://public-dns/multicast/multicastplayer/multicastplayer.html, we have this message : The connection attempt to FMS failed.
In the server administration we can view the Flash Media Live Encoder session but the multicastplayer cannot connect on the rtmfp://public-dns/multicast
In the server we can see some package arrived in prot 80 and 1935 but multicastplayer cannot connect
Have ideas?

We have exactly the same issue and it's really frustrating for a service that is willing to be easy to setup (version 4.0.3, large amazon instance)
We are following the same tutorial and flash media encoder is successfully sending the stream. I can see the stream in the Administration console and bytes in/message in are increasing properly.
When I try to connect using the multicast player same happens : after few seconds, page remain black and the message " The connection attempt to FMS failed."
After tcpdump investigation i can see that it is not a network problem, when I connect using the multicast player I see first connexion to port 80 of server and THEN udp traffic IN and OUT from port 1935. In the admin console the client doesn't appear.
Any clue?
BTW I tried with a 4.0.2 instance and same problem!

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