While connecting to a remote desktop using Remote Desktop Protocol (RDP) you may see this error message on your computer stating “ An authentication error has occurred. Change the group policy Encryption Oracle Remediation default setting from Vulnerable to Mitigated. 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. On the client run gpedit.msc , and then browse to Computer Configuration > Administrative Templates > System > Credentials Delegation in the navigation pane. Several users encountering the An Authentication Error Has Occurred the Function Requested is Not Supported error have been able to resolve the issue by using the Group Policy editor to modify the Encryption Oracle Remediation policy. But you can work around this issue by following this guide (here) to install the Local Group Policy Editor on Windows 10 Home edition. Microsoft recently fixed RCE (Remote Code Execution) Vulnerability in CredSSP in March Updates of Windows. 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. You need to update your server with newest updates from Microsoft. Use group policy to change the Credential Delegation at the client. Rename the current CredSsp.admx to CredSsp.admx.old; Copy the new CredSsp.admx to this folder. An authentication error has occurred. Once you have pushed the patch out to the servers you will need to “unconfigure” the Group Policy. Some Group Policy keys might need to be changed in order to grant access. An attacker who successfully exploited this vulnerability could relay user credentials and use them to execute code on the target system. The function requested is not supported. Note: If you can’t see the AllowEncryptionOracle DWORD, set up a new DWORD by right-clicking an empty space on the right of the Registry Editor window and selecting New > DWORD.Enter AllowEncryptionOracle as the DWORD name. On the same DC navigate to: C:\Windows\SYSVOL\sysvol\\Policies\PolicyDefinitions\en-US (or your local language) Rename the current CredSsp.adml to CredSsp.adml.old; Copy the new CredSsp.adml file to this folder. Several users encountering the An Authentication Error Has Occurred the Function Requested is Not Supported error have been able to resolve the issue by using the Group Policy editor to modify the Encryption Oracle Remediation policy. The most correct way to solve the problem is to install the latest cumulative Windows security updates on a remote computer or RDS server (to which you are trying to connect via RDP);; Workaround 1.You can disable NLA (Network Level Authentication) on the RDP server side (as described below); Workaround 2.You can re-configure your desktops by … The issue is that at least on virtual machines, Server 2012 won’t let you RDP into the box. You can download Restoro by clicking the Download button below. You can read - How to Fix Authentication Error Function Not Supported CredSSP Error RDP for more information on the Group Policy and registry key. 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Home versions don’t have the Local Group Policy Editor installed by default, so you won’t be able to complete the steps below. This could be due to CredSSP encryption oracle remediation “. CredSSP authentication error appears only when you try to connect via RDP from a computer on which the latest security updates are installed to a non-updated computer (for example, a computer that never gets updates, or a clean installed device with a Windows 10/Windows Server 2016 build that was released before March 2018). To fix this issue, install the May 2018 Windows Updates on both the server and the local PCs. Down below, you’ll find a collection of methods that other users in a similar situation have used to resolve the An Authentication Error Has Occurred the Function Requested is Not Supported error. Superior record of delivering simultaneous large-scale mission critical projects on time and under budget. 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