SGOS V6 introduced new Flash(RTMP) proxy with an optional license. If the ProxySG appliance does not have such a license installed, the appliance can still handle 'Flash over HTTP' traffic using the HTTP proxy service.
However, certain CPL policy conditions, such as
*Streaming.content="flash"
*Client.Protocol=(rtmp,rtmpt,rtmpe,rtmpte)
do not affect Flash over HTTP traffic. This is expected behavior due to HTTP Proxy service is processing such traffic.
This only occurs when streaming flash http-handoff is set to disable because flash traffic processes HTTP-Proxy only, instead of Flash-Proxy.
The best scenario should be upgraded to Native Flash-Proxy capability on the proxySG, So advanced features about Flash streaming traffics also work on there.