Table of Contents
What is RDP authentication error?
Windows uses CredSSP protocol (Credential Security Support Provider) for authenticating clients on the RDP servers.
Go toWindows Updateand check for updates.

RDP Authentication Error Function Requested Is Not Supported
Install all the updates specifically related toCVE-2018-0886.
A server reboot will be required after installing these updates.
CredSSP Parameters Registry(364 bytes, 13,801 hits)
This is a simple registry file.

Credentials Delegation Group Policy
Uninstalling these updates requires the computer to be restarted.
I had the same issue with my data pipe.
All the above mentioned solutions worked for me on my company web connection.

Encryption Oracle Remediation policy
I fixed it by updating all my Windows Server installations and also the client computers.
There were some environments which required not updating the server at all.
I used the second method to fix RDP authentication error messages from those servers.

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