FLVPlayback and RTMP

Trying to connect via RTMP protocol to a streaming server with the compiled FLVPlayback control but it wont work. The address to the FLV-file is rtmp://localhost/streamcast/livestream.flv. If I select the file via file system - C:\blabla - it works. It also works via the webserver but, as I sad, not using the RTMP-protocol.

Any proposals?