RDP : An authentication error occurred This could be due to CredSSP encryption oracle remediation

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Problem

I am trying to connect a remote machine through Remote Desktop Connection (RDP client) from my local Windows 10 machine and receiving the error “An authentication error has occurred. The function requested is not supported. This could be due to CredSSP encryption oracle remediation.”

RDP An authentication error has occurred. The function requested is not supported. This could be due to CredSSP encryption oracle remediation.

Cause

After analyzing some time, found that this error is occurring after May 2018 Security update . Please check this link for more info: https://blogs.technet.microsoft.com/yongrhee/2018/05/09/after-may-2018-security-update-rdp-an-authentication-error-occurred-this-could-be-due-to-credssp-encryption-oracle-remediation/

Solution

  • Connect the problematic remote machine from different computer (other than your current computer).
  • In remote computer, right-click on My Computer (This PC) -> click Properties.
  • Now click Remote Settings and un-check the option “Allow connections only from computers running Remote Desktop with Network Level Authentication” and Apply the settings.
Remote Desktop Connection An authentication error has occurred. The function requested is not supported. This could be due to CredSSP encryption oracle remediation.
  • Now try to connect from your local machine.

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