Policy
Set Teredo Client Port
This policy setting allows you to select the UDP port the Teredo client will use to send packets. If you leave the default of 0, the operating system will select a port (recommended). If you select a UDP port that is already in use by a system, the Teredo client will fail to initialize. If you enable this policy setting, you can customize a UDP port for the Teredo client. If you disable or do not configure this policy setting, the local host setting is used.
6ab1b289b4f1 Teredo_Client_Port Registry
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HKLM\Software\Policies\Microsoft\Windows\TCPIP\v6Transition\Teredo_ClientPort Policy notes
This policy setting allows you to select the UDP port the Teredo client will use to send packets. If you leave the default of 0, the operating system will select a port (recommended). If you select a UDP port that is already in use by a system, the Teredo client will fail to initialize. If you enable this policy setting, you can customize a UDP port for the Teredo client. If you disable or do not configure this policy setting, the local host setting is used.