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The RTMP protocol has multiple variations:
RTMP: The "plain" protocol which works on top of and uses TCP port number 1935 by default.
RTMPS: which is RTMP over a TLS/SSL connection.
RTMPE: which is RTMP encrypted using Adobe's own security mechanism. While the details of the implementation are proprietary, the mechanism uses industry standard cryptographic primitives.
RTMPT: which is encapsulated within HTTP requests to traverse firewalls. RTMPT is frequently found utilizing cleartext requests on TCP ports 80 and 443 to bypass most corporate traffic filtering. The encapsulated session may carry plain RTMP, RTMPS, or RTMPE packets within.
RTMFP: which is RTMP over UDP instead of TCP, replacing RTMP Chunk Stream. The Secure Real-Time Media Flow Protocol suite has been developed by Adobe Systems and enables endā€users to connect and communicate directly with each other (P2P).