Authentication Error Has Occurred Remote Desktop

In March 2018, Microsoft released a security update that fixes a vulnerability in the Credential Security Support Provider Protocol (CredSSP). This vulnerability (CVE-2018–0886) allows an attacker to remotely execute arbitrary code on a vulnerable Windows host with an open RDP port (TCP/3389). In May 2018, an update '2018-05 Security only/Monthly Rollup' was released. It blocks the connection to computers with an affected version of CredSSP.

• Remote Desktop An Authentication Error
• Remote Desktop Authentication Error 0x80004005

A) A windows 7 machine hosting Remote Desktop: A client Windows 7 PC had no problem connecting to it, but the same user connecting from a Windows 10 machine failed. B) If the client is not patched while the server is updated, RDP can still work.

Apr 24, 2020 After an update to Windows 10 released back in May 2018, a lot of users who use Remote Desktop function started getting the RDP 'authentication error, function requested is not supported' issue where the users get the following error message while logging in to a remote computer via RDP. 'An authentication error has occurred. When I power up my system regularly, it gives the 'reboot and select proper boot device error' However, if I boot into the BIOS, there is a seemingly blank boot option. If selected, my machine will boot correctly into Windows, and I will have access to my full 500GB drive. On the Remote tab, select the option 'Allow connections from computers running any version of Remote Desktop (less secure)'. You can also disable Network Level Authentication (NLA) using the Local Group Policy editor – gpedit.msc (you can run the gpedit.msc in Windows 10 Home edition like this) or using the domain group policy management. This article can help you troubleshoot authentication errors that occur when you use Remote Desktop Protocol (RDP) connection to connect to an Azure virtual machine (VM). Symptoms You capture a screenshot of an Azure VM that shows the Welcome screen and indicates that the operating system is running.

Omnisphere keygen generator plugin. When you try to connect to a remote computer with a vulnerable CredSSP from Windows 10/Windows Server 2016, you receive the Remote Desktop Connection error:

An authentication error has occurred.
The function is not supported.
Remote Computer: hostname
This could be due to CredSSP encryption oracle remediation.

For more information, see link.

On Windows 7, the CredSSP error looks like this:

An authentication error has occurred. Reiterate.

The function requested is not supported.

Remote computer: hostnname

To fix This could be due to credssp encryption oracle remediation error, you need to install the latest Windows security update on the remote computer. You can install the latest Cumulative Update for your Windows version. You can download the update manually via Microsoft Update Catalog or install it via Windows Update or WSUS.

Hint. 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).

Hint. There is a workaround allowing you to connect to a computer with a vulnerable version of CredSSP. To do this, you need to configure a special Group Policy parameter named Encryption Oracle Remediation on your computer from which you are establishing the Remote Desktop connection.

1. Press Win+R, type gpedit.msc, and press Enter;
2. Go to the following section of the Local Group Policy Editor: Computer Configuration > Administrative Templates > System > Credentials Delegation;
3. Open the policy setting Encryption Oracle Remediation;
4. Change its state to Enabled, and set Vulnerable in the Protection Level field;
   
5. Update the Group Policy settings using:

Hint. You can also allow your computer to connect to vulnerable versions of CredSSP through the registry. Run the following command through elevated command prompt:

Now you can connect to the remote host via RDP and install the updates. After upgrading, don't forget to disable the policy or reset the AllowEncryptionOracle registry value to its original value:

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There are 3 options in the 'Encryption Oracle Remediation' policy:

• Vulnerable — the client can connect to vulnerable computers;
• Mitigated — the client cannot connect to vulnerable servers, but the servers can allow vulnerable clients to connect;
• Force Updated Clients — secure RDP CredSPP interoperability layer.

If from a computer that doesn't have the CredSPP security update installed you can't connect to an updated RDP/RDS host with the 'Force updated clients' option enabled, you can allow the server to accept connections with an affected version of CredSPP. To do this, you need to enable the policy with the Mitigated value on the server. In this way, to make changes to the server you can remotely connect to it via PowerShell under admin credentials:

And allow the connection:

In all cases, Microsoft always recommends installing the latest Windows updates on both the RDP server and the client.

Remote Desktop An Authentication Error

Remote Desktop Authentication Error 0x80004005