A few Months Ago, Microsoft pushed an update on all its OS. This update bearing the name of KB4093492 may cause problems of RDC connection on some servers.

For many customers this was the case, so that will give you a solution if you also encounter this problem.

When you start the connection to the remote server with the Remote Desktop Connection tool , you get the following error:

this could be due to credssp encryption oracle remediation

If you encounter this error, there are several solutions.

You can uninstall the KB4093492 very well , but here we will see a simpler way around it.

Via PowerShell / Regedit

From the impacted computer, launch Powershell in admin and type the following command:

reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters" /f /v AllowEncryptionOracle /t REG_DWORD /d 2

You should then be able to login.

If this problem impacts many posts, you can also play with GPOs to fix your problem on all computers on the network or an OU.

Via GPO

Before doing anything, remember to update your ADMx  if it’s not done yet.

Then from your GPO editor create a computer GPO with the following settings:

Computer Configuration > Administrative Templates > System > Credential Delegation > Encryption Oracle Remediation

Double-click on Encryption Oracle Remediation then check ”  Enabled” and select ”  Vulnerable “.