NetStream.Play.InsufficientBW when streaming server side playlist

Hi

I am streaming pre recorded audio files (mp4) to an AIR client. I have tried two different solutions,

streaming the file directly with the NetStream.play("mp4:xxxxx.m4a") and creating a server side playlist, adding the

same sound clip and then streaming the playlist. The problem is, when streaming the playlist i get a few NetStream.Play.InsufficientBW, this does not happen when streaming the file direct. Both solutions uses bufferTime=1.0

I would like to use a server side playlist to implement a simple key solution so that the client dont know the full path to

the file, but instead sends a key to a custom server side function that looks up the file path and creates a stream for the client.

TIA

Ruben Chadien

FMS 4.0(linux)