Home versions don’t have the Local Group Policy Editor installed by default, so you won’t be able to complete the steps below. Kevin is a dynamic and self-motivated information technology professional, with a Thorough knowledge of all facets pertaining to network infrastructure design, implementation and administration. If the issue is with your Computer or a Laptop you should try using Restoro which can scan the repositories and replace corrupt and missing files. So, now we are bypassing this restriction by enabling few settings or you can patch up the client PC to the latest version of Windows. Steps to solve CredSSP Encryption Oracle Remediation error with Local Group Policy Editor: Open the Local Group Policy Editor. Change the group policy Encryption Oracle Remediation default setting from Vulnerable to Mitigated. If either of the involved machines doesn’t have the security update, you will get the An Authentication Error Has Occurred the Function Requested is Not Supported error. This error may also look like this: An authentication error has occurred. You need to update your server with newest updates from Microsoft. When the destination computer you are connecting to is up-to-date, then you never see this encryption error. Microsoft has found a credssp error in rdp and found a fix for the vulnerability by mandatory requiring to update both the client and server computer to work properly. This could be due to CredSSP encryption oracle remediation”, this is because you are connected from an unpatched client to a patched server or a patched client to an unpatched server. In March 2018, Microsoft released updates that block remote code execution using a vulnerability in the CredSSP (Credential Security Support Provider) protocol (bulletin CVE-2018-0886). There are three settings contained in the policy setting that can be enabled. This is true even if Remote Desktop access is enabled either manually or by group policy. Some users are encountering the An Authentication Error Has Occurred the Function Requested is Not Supported error when trying to use the Remote Desktop Connection between two Windows computers. Once you’ve ensured that the Local Group Policy editor is installed on your computer, follow the steps below to enable the Encryption Oracle Remediation policy: If you’re still encountering the error or this method wasn’t applicable to your windows version, move down to the next method below. Remote computer: . This could be due to CredSSP encryption oracle remediation. Use group policy to change the Credential Delegation at the client. Some Group Policy keys might need to be changed in order to grant access. This RDP authentication issue can occur if the local client and the remote host have differing Encryption Oracle Remediation settings that define how to build an RDP session with CredSSP. This problem may occur in Windows 10, Windows 8/8.1, Windows 7, Windows Vista, Windows Server 2016, Server 2012 and Server 2008. Fix CredSSP Encryption Oracle Remediation Error In Windows 10: https://techempty.org/?p=708Those of you who may have installed … Here’s a quick guide on using the Registry Editor to modify the AllowEncryptionOracle to resolve the An Authentication Error Has Occurred the Function Requested is Not Supported error: Fix: An Authentication Error Has Occurred the Function Requested is Not Supported. The function requested is not supported. Before you move on to the solutions, make sure that you have an active internet connection and are logged in as an administrator. I don’t have steps for this yet, but it’s fairly simple. An attacker who successfully exploited this vulnerability could relay user credentials and use them to execute code on the target system. Change the group policy Encryption Oracle Remediation default setting from Vulnerable to Mitigated. I had to go into Group Policy and change a setting to get back into the unpatched Server 2008 box. You can download Restoro by clicking the Download button below. There are some problems in the group policy editor. This is simple to do. This is not recommended for a permanent solution since it means that the vulnerability could still exist on the servers. Note: This method will not be applied by default if you’re using a Home version of Windows 7, Windows 8.1 or Windows 10. Based on what we gathered, there are several different scenarios that will trigger this particular error message. My Windows 10 installed the latest updates yesterday. Your first step is to let RDP through the firewall. Force Updated Clients: This is the highest level of protection because it requires applying the update to all clients you are going to communicate with using CredSSP. When you try to connect to a computer that does not have the CredSSP encryption oracle remediation error update, the Remote Desktop Connection will display the an error message telling that you that an authentication error has occurred due to CredSSP encryption oracle remediation. Most affected users report that the issue only started appearing after a Windows update was performed. how to fix restoring your previous version of Windows error, 5 Ways to Auto Shutdown Windows 10 at a Specified Time, How to Solve Keyboard typing wrong characters error in Windows 10. Allow Remote Desktop Access Through Windows Firewall. For the Group Policy, you'll need the ADMX files from a patched server. CredSSP Encryption Oracle Remediation Policy Settings. The issue is that at least on virtual machines, Server 2012 won’t let you RDP into the box. If this is a domain-joined VM, first stop the Group Policy Client service to prevent any Active Directory Policy from overwriting the changes. set local group policy 'Encryption Oracle Remediation' to 'Vulnerable'. On the client run gpedit.msc , and then browse to Computer Configuration > Administrative Templates > System > Credentials Delegation in the navigation pane. We investigated this particular issue by looking at various user reports. An authentication error has occurred. This error statement pops up due to either wrong policy settings or corrupted registry issues. Group Policy Temporary Workaround Fix for Authentication Error Function Not Supported CredSSP Error If you cannot update your server right away, then the temporary workaround is to change a Group Policy. 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