Patrick Domingues

In a few steps I will show you how to fix the remote desktop CredSSP encryption oracle error. CredSSP is an authentication provider which processes authentication requests for other applications; any application which depends on CredSSP for authentication may be vulnerable to an attack. An update released by Microsoft (KB 4093492)on May 8, 2018, for Windows 10 Operation System was targeted to change the default settings CredSSP from Vulnerable to Mitigated.

However, after patching this caused an issue where the patched clients were blocked from communicating with unpatched servers over RDP protocols.

Lets Get Started

We will be using group policy settings to make changes described below to rollback the changes to ‘Vulnerable’ state to allow RDP access.

1. Open Group Policy Editor, by executing gpedit.msc
2. Policy path: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation
3. Run gpedit.msc and expand Administrative Templates
   
   
   
4. Expand System
   
5. Expand Credential Delegation
   
   
6. Edit Encryption Oracle Remediation
   
   
7. Select Enabled and change Production Level to Vulnerable
   
   
8. Run the command gpupdate /forceto apply group policy settings.

Your remote desktop connection will be working fine now.

I hope this article was helpful, if you have any questions please feel free to contact me. If you would like to be notified of when I create a new post you can subscribe to my blog alert.

Patrick Domingues

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