Problem getting FLVPlayback to work with Streaming Server

Question

I am trying to use the CS4 Flash FLVplayback component to connect to a streaming server. I know the stream is accessible because I can create the connection and view the video using Actionscript, but I would love to use the built in features of the component.

I am dragging a FLVplayback component onto the stage, setting "isLive" to true and setting the source to my stream to the same URL that works with my Actionscript. When I click "OK" after entering the URL I get a progress window labled "Getting Metadata" which runs for 5 seconds or so. When I publish the file the playback component just shows the loading animation but never loads. I have tried both "rmtp://" and "rmtpt://" at the beginning of the URL.

Any ideas about soemthing I'm overlooking? Thanks.