The Stratus servers use UDP ports 1935 and 10000-10100 (ports
other than 1935 are subject to change at any time, though).
However, the Flash Players using RTMFP can use any UDP port in the
Since the whole point of using Stratus is to facilitate
end-to-end direct connections between Flash Players using RTMFP,
your firewall will have to allow outbound UDP to any port in the
range 1024-65535. Preferably without translating the IP address or
port number, and preferably allowing return traffic from any IP
address/port number once an outbound packet has been sent, not just
from only the IP address and port number to which an outbound
packet was sent.