Problem on publishing live stream with RTMPT protocol to AMS, flash applet running on Safari MAC

• Safari / Mac / RTMP => OK
• Any Browser else / Mac / RTMP => OK
• Safari / Win / RTMP => OK
• Any Browser else / Win / RTMP => OK
• Safari / Mac / RTMPT => KO
• Any Browser else / Mac / RTMPT => OK
• Safari / Win / RTMPT => OK
• Any Browser else / Win / RTMPT => OK

Any Idea ?