Enable RTSP in iptables

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http://unix.stackexchange.com – I'd like to receive a RTSP stream via VLC, but when I try to run sudo -u non_root_user cvlc -vvv -I dummy rtsp://ip:port/x.sdp I get: Unable to determine our source address: This computer has an invalid IP address: 0x0 I think that the ports might be closed, because when I disabled firewall, I was able to receive the stream. I'd like to ask you how to set the iptables so I can receive RTSP. Thanks. (HowTos)