Error: This could be due to CredSSP encryption oracle remediation


Solution: Create reg file as below.


Windows Registry Editor Version 5.00

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

"AllowEncryptionOracle"=dword:00000002



Or copy same from \\192.168.2.17\Softwares\Basic_Softwares\registory\RDC.reg


RDC and connections to VMs via VMMSSP both broke.


Fix (workaround) is below


found this https://support.microsoft.com/en-us/help/4103721/windows-10-update-kb4103721


    Addresses an issue that may cause an error when connecting to a Remote Desktop server. For more information, see CredSSP updates for CVE-2018-0886.


directed to here https://support.microsoft.com/en-us/help/4093492/credssp-updates-for-cve-2018-0886-march-13-2018


    An update to change the default setting from Vulnerable to Mitigated.


the update changed


Policy path: "Computer Configuration -> Administrative Templates -> System -> Credentials Delegation"


Setting name: "Encryption Oracle Remediation"


I enabled the local policy and set it back to Vulnerable


Both RDC and VMs via VMMSSP are working