This could be due to CredSSP encryption Oracle Remediation

When you are trying to connect to a Remote Desktop (on a VPN) and get the above error on a Windows machine, one way to solve the problem is as follows.

  1. Open RegEdit
  2. Take a backup of the entire Registry (Export) so that you can revert back, if required.
  3. Navigate to
    HKEY_LOCAL_MACHINE > SoftwareMicrosoft >  Windows >  CurrentVersion >  Policies > System
  4. Right click on System, select New > Key and name it as CredSSP.
  5. Now right click on CredSSP and create a key – Parameters
  6. In Parameters, create a new DWORD (32-bit) value with the name AllowEncryptionOracle.
  7. After creating the file, right click on it and Modify.
  8. Set Value data to “2” and Base to “Decimal”.
  9. Click OK

The error should have gone!

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