wdsmcast useage and deployment

I'm trying to use WDS multicasting to deploy an image. For some reason I can't get it to connect. Anyone know any guides on how to do this because I followed and few and none are working.

I setup a multicast session from the WDS server.

Then i boot into Windows PE from the machine I want to pull the download from. I have the utility wdsmcast on that cd and i run it. Put in all the information and it seems right, but i get Transfer Failed. I tried changing a few things, but it never seems to want to download. Not sure if I'm using it correctly or what.

Thanks