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Why is TCP port 21688 used for the audio?

April 26, 2017audio port TCP Used

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Why is TCP port 21688 used for the audio?

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Any TCP port can be used. 21688 is recommended simply because Radio Control Server uses port 21687. For home users with a commercial router/firewall from LinkSys, D-Link, Belkin, or other companies, a single port fowarding rule can be created for ports 21687-21688, inclusive.