Authentication error has occurred, Function requested is not supported

If when you try to utilize the Remote Desktop Connexion between two Windows computers and you receive the error message – Remote Desktop Connection error, An Hallmark error has occurred, The Function requested is not supported, and so this post is intended to help yous. In this postal service, we will identify some potential known causes that can trigger the error then provide the possible solutions you can attempt to help remediate this issue.

When the Remote Desktop Connectedness hallmark fails, you'll receive the following error bulletin;

Remote Desktop Connexion

An authentication error has occurred.
The role requested is non supported.

Remote computer: Computer_Name or IP_Address
This could exist due to CredSSP encryption oracle remediation.
For more data, see https://go.microsoft.com/fwlink/?linkid=866660

Equally you tin can see from the image above, the mistake message is caused by the CredSPP Encryption Oracle Remediation. You can fix the 'An authentication error has occurred, This could be due to CredSSP encryption oracle remediation' mistake past using Registry or Grouping Policy Editor.

Recently Microsoft institute that a remote code execution vulnerability (CVE-2018-0886: encryption oracle attack) exists in CredSSP versions. An attacker who successfully exploits this vulnerability could relay user credentials to execute code on the target system. And so any application that depends on CredSSP for hallmark was vulnerable to this blazon of assault.

To patch this security hazard, Microsoft released a security update addressing the vulnerability by correcting how CredSSP validates requests during the authentication process. The patch updated CredSSP hallmark protocol and Remote Desktop clients for all afflicted platforms.

Afterward installing the update, patched clients were not able to communicate with unpatched servers. In other words, if the client figurer has the security update installed simply the server computer was not updated with the security update (or vice versa), the remote connection was unsuccessful and user received above-mentioned error message.

Hallmark error has occurred, Part requested is not supported

If you're faced with Remote Desktop Connexion fault, An Authentication error has occurred, The Role requested is not supported error message, you can endeavour our recommended solutions below to resolve the upshot.

1. Update Windows 10 with the latest security patches
2. Alter the Encryption Oracle Remediation policy
3. Create and configure the AllowEncryptionOracle registry fundamental

Permit'due south accept a look at the description of the process involved in relation to each of the listed solutions.

i] Update Windows 10 with the latest security patches

In this solution, it is recommended you install the CredSSP security patch in both computers (server and client). Alternatively, you can click Get-go > Settings > Update & Security > Windows Update > Check for Updates to download and install the latest cumulative update.

Once both computers have the CredSSP patch installed, the An Authentication fault has occurred – The Function requested is not supported error bulletin will be resolved.

If due to some reasons, you can't install the security update in server or client computer, you can then use solutions 2 and 3 below.

2] Alter the Encryption Oracle Remediation policy

The error message tin exist resolved by using the Grouping Policy editor to change the Encryption Oracle Remediation policy.

Notation: This method does not utilise to Windows 10 Home edition considering the Local Group Policy Editor is not installed by default. Merely you can work effectually this issue by calculation Local Group Policy Editor to Windows x Domicile edition.

To enable the Encryption Oracle Remediation policy, practice the post-obit:

• Press Windows cardinal + R.
• In the Run dialog box type gpedit.msc and press Enter to open Group Policy Editor.
• Inside the Local Group Policy Editor, utilize the left pane to navigate to the path below:

Calculator Configuration > Administrative Templates > Arrangement > Credentials Delegation

• On the correct pane, double-click on Encryption Oracle Remediation to edit information technology's properties.
• With the Encryption Oracle Remediation policy opened, fix the radio push to Enabled.
• Side by side, scroll down to Protection Level and change it to Vulnerable.
• Click Utilise > OK to save the changes.

You can now exit the Local Grouping Policy Editor and restart your computer. On boot, try the RDP connexion once again and see if the issue is resolved.

three] Create and configure the AllowEncryptionOracle registry primal

This is the equivalent of enabling theEncryption Oracle Remediationpolicy. You can resolve the effect past creating and configuring the following registry central:

AllowEncryptionOracle: DWORD: 2

Since this is a registry operation, it is recommended that you dorsum up the registry or create a system restore point in case the procedure goes wrong.

Once you have taken the necessary precautionary measures, you can proceed as follows:

• Printing Windows key + R.
• In the Run dialog box, type regedit and printing Enter to open up Registry Editor.
• Navigate or jump to the registry key path below:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Organisation

• Right-click Organization, select New > Key and fix its name as CredSSP.
• Side by side, right-click CredSSP, select New > Key and gear up its name as Parameters.
• Now, right-click on the blank space on the right pane so select New > DWORD (32-chip) Value.
• Rename the value name equally AllowEncryptionOracle and hit Enter.
• Double-click on the new value to edit its properties.
• Input 2 in the Value data box and printing Enter to save the change.
• Exit Registry Editor and restart you PC.

You should now exist able to constitute the Remote Desktop Connection successfully!

Source: https://www.thewindowsclub.com/authentication-error-has-occurred-function-requested-is-not-supported

Posted by: bateshipleoped.blogspot.com

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