To access your pentesting VPS via windows remote desktop ( RDP ) you can use any client that support the RDP protocol.
Be aware that you MUST NOT be logged into your Kali Linux VPS via the console when trying to use RDP.
If you cannot access via RDP it means you have either changed the settings or you have used the VNC client and are logged into the VPS. Once you log out of the console you can then use RDP to access.
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