Authentication Failure

An authentication error has occurred – Using RDP

You may receive the following error when using RDP to connect to a server:

An authentication error has occurred.

The function requested is not supported.

This could be due to CredSSP encryption oracle remediation.​

This is due to an MS update repairing a vulnerability.

To resolve,

Execute gpedit.msc and browse to Computer Configuration / Administrative Templates / System / Credentials Delegation in the left pane.

Change the “Encryption Oracle Remediation” policy to Enabled, and “Protection Level” to Vulnerable

Close gpedit and try again!

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