RDP can't connect to remote host with Credssp-encryption error

If the Server is not upgraded, upgraded client will not able to connect.

In this case, you can set the registry to allow unsecured connections:

Run the following command to add a registry value:
REG ADD HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters\ /v AllowEncryptionOracle /t REG_DWORD /d 2

https://support.microsoft.com/en-us/help/4295591/credssp-encryption-oracle-remediation-error-when-to-rdp-to-azure-vm

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