Error
Remote desktop connection
An authentication error has occurred.
The function requested is not support
This could be due to CredSSP encryption oracle remediation
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Best Answer
Method 1. Disable Network Level Authentication on RDP Server.
1. Open System Properties and select the Remote tab.2. Un-check (clear) the Allow connections only from computers running Remote Desktop with Network Level Authentication checkbox and click OK. *
3. Now try to connect from the RDP client to the server.
Method 2. Enable the Encryption Oracle Remediation on RDP Client.
1. Simultaneously press the Windows 
+ R keys to open the run command box.
2. Type gpedit.msc & Press Enter.
3. In Group Policy Editor navigate to the following path (in the left pane):
Computer Configuration -> Administrative Templates -> System -> Credentials Delegation
4. At the right pane, open the Encryption Oracle Remediation settings.
5. Choose Enable, set the 'Protection Level' to Vulnerable and click OK.