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An authentication error has occurred. The function requested is not supported. 

Cause

This issue usually occurs on Windows 7 systems where the MSTSC (Remote Desktop) is earlier than version 6.2.

Resolution

Update the MSTSC to a supported version by applying the required Windows update.

1. Check the system type.

   1. Go to Control Panel > System and Security > System.

   2. Check whether the system type is 32-bit or 64-bit.
      

2. Ensure Windows Update service is enabled.

   1. Press Windows+ R.

   2. Type services.msc and press Enter.

   3. Scroll down and locate Windows Update.

   4. Double-click the service.

   5. Set Startup type to Manual to enable it.
      

   6. Click Apply > OK.

3. Install the DTLS support update.

   1. Click here to download the update.
      For example:

      1. For 32-bit systems: Download All supported x86-based version of Windows 7.

      2. For 64-bit systems: Download All supported x64-based version of Windows 7.
         
         

   2.  Install the update.
   3. Restart the system when prompted.

4. Install the RDP 8.0 update.

   1. Click here to download the update.
      For example:

      1. For 32-bit systems: Click Download the Update for Windows 7 SP1 for x86-based systems package now.

      2. For 64-bit systems: Click Download the Update for Windows 7 SP1 for x64-based systems package now.
         
         

   2. Install the update.
   3. Restart the system when prompted.

5. Verify the MSTSC version.

   1. Navigate to C:\Windows\System32 >mstsc.exe.

   2. Right-click and select Properties.

   3. Go to the Details tab.

   4. Ensure the following details are displayed:

      1. File version: 6.2.xx.xxx

      2. Product version: 6.2.xx.xxx

6. Connect to the Virtual Machine.

   1. Log in from the client and click Connect.

   2. Click Yes to confirm.

      The connection to the Virtual Machine will be established.