To resolve the Remote Desktop Protocol (RDP) authentication error related to the CredSSP encryption oracle remediation on Windows OS, you can follow these steps:

1. Update your Windows OS: Ensure that both the local and remote computers have the latest Windows updates installed. Microsoft often releases security patches and updates to address known issues, including CredSSP-related vulnerabilities.
2. Registry modification (for client-side):

• Press Win + R on your keyboard to open the Run dialog box.
• Type regedit and press Enter to open the Registry Editor.
• Navigate to the following registry key:

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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters

• If the Parameters key does not exist, you may need to create it.
• Inside the Parameters key, create a new DWORD value named AllowEncryptionOracle.
• Set the value of AllowEncryptionOracle to 2 (hexadecimal).

Group Policy modification (for server-side):

• Press Win + R on your keyboard to open the Run dialog box.
• Type gpedit.msc and press Enter to open the Local Group Policy Editor.
• Navigate to the following policy:

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Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

• Double-click on "Encryption Oracle Remediation" to open the policy settings.
• Select the "Enabled" option.
• Under "Options," choose "Vulnerable" or "Mitigated" based on your security requirements. Selecting "Vulnerable" allows insecure clients to connect, while "Mitigated" only allows secure connections.
• Click OK to save the changes.

Restart your computer: After making the necessary changes in the Registry Editor or Group Policy Editor, restart your computer to apply the modifications.