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Run Windows Update on both the client side and the server side, and restart both your client/workstation and server once the updates are installed. To resolve the problem, you would need to ensure that both the RDP client and server are patched to the latest version.
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If you have updated your RDP client and tried to connect to an RDP server which has not been patched, you will get the above error messages.
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This was due to the CredSSP updates on Remote Desktop (RDP) servers and client rolled out by Microsoft, as described on their documentation at below URL: This could be due to CredSSP encyrption oracle remediation. If you are not able to login to your Windows servelet using RDP with below error messages:
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