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Remote desktop connection: An authentication error has occurred.

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Admin

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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1 Answer
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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.

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