Streaming appears to be working from Adobe Encoder, but can not view the live stream - help?!

I just installed AMS 5 on a Windows Amazon server, and am trying to view the live stream via web browser. Can't seem to get it working. I've followed the instructions that is shown here:

http://help.adobe.com/en_US/adobemediaserver/devguide/WSd391de4d9c7bd609-52e437a812a3725dfa0-8000.2.3.html

I can successfully connect using Adobe Encoder and am streaming to it (I can see network traffic coming into the server).

When I view here: http://osmf.org/dev/2.0gm/StrobeMediaPlayback.html?src=http://...

I get "Error #2048".

Can someone spare a few minutes and help me along?

Thanks!