Hello,
I guess this is because this host used rtmp streaming , as your customer is behind a corporate firewall or some sort of proxy this can be easily filtering...
Our service can stream in rtmp also but by default we used http-pseudo streaming, which is better at punching holes through firewalls.
here is some information about the different kind of streaming technology :
www.longtailvideo.com/support/blog/19578...t-is-video-streaming