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

So you go to login to via RDP to a server, workstation or remote PC and you get this error:

Not to worry, here is the fix as well as the why.

First run windows update on your local system and try again.

Quick fix: (not secure)

  1. Use the Windows+R key to open the Run Command. (If you keyboard lacks the windows key you can use Ctrl+Alt+DEL, open task manager, then click file and "Run".)
  2. In the run command type in gpedit.msc which will open the Local Group Policy Editor.
  3. Expand Computer Configuration > Administrative Templates > System > Credentials Delegation.
  4. Update the Encryption Oracle Remediation policy to Enabled, then change Protection level to Vulnerable.
  5. After doing this it is advisable to update your remote system and switch these settings back.

Proper fix: (secure)

Update the remote server, in some cases the remote server may show that is it up to date in which case you may have a compromised system and will need to follow the following steps in order to force the update after which you should do a full scan on the system for potential malware.

Why:

After the May 2018 update RDP no longer connects by default to a remote system that is not running the CredSSP update.