ERRCONNECT_TLS_FAILED (0x00000008)

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When launching an RDP session in Remote Desktop Manager macOS you get the error message: ERRCONNECT_TLS_FAILED (0x00000008).

Solution

To correct this error, enable the TLS 1.2 under the remote server located here: HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols

KB4959

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