FIX: The local security authority cannot be contacted

Matthew Adams
by Matthew Adams
Windows & Software Expert
Last update:
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The local security authority cannot be contacted
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Windows 10’s Remote Desktop enables users to connect with a remote PC. However, a local security authority error can arise for some users when they try to set up, or log in to, a remote desktop connection.

The full error message states:

An authentication error has occurred. The local security authority cannot be contacted.

As a consequence, a remote connection can’t be established.


This is how you can fix the local security authority error

1. Check that Remote Desktop is enabled

  1. First, check that the basic Remote Desktop setting is enabled.
  2. To do that, click Windows 10’s Type here to search taskbar button.
  3. Input the keyword remote desktop settings in the search box.
    The search tool the local security authority cannot be contacted windows 10
  4. Click Remote Desktop settings to open further options.
  5. Then toggle the Enable Remote Desktop setting on if it’s off.

2. Unblock remote access

Users have confirmed they’ve fixed the local security authority error by deselecting the Allow connections only from computers running Remote Desktop with Network Level Authentication setting.

  1. To do so, right-click the Start menu and select Run.
  2. Input sysdm.cpl and click OK to open the window in the shot directly below.
    System Properties window the local security authority cannot be contacted windows 10
  3. Click the Remote tab.
  4. Then select the Allow remote connections to this computer connections setting if you need to .
  5. Deselect the Allow connections only form computers running Remote Desktop with Network Level Authentication (recommended) option if it’s checked.
  6. Click the Apply option.
  7. Click OK to exit the window.

3. Switch to Google DNS

Some users might need to switch to Google DNS to resolve the local security authority error.

  1. To do that, open Run’s window.
  2. Input ncpa.cpl in the Open box and click OK to open Network and Sharing Center.Network Connections applet the local security authority cannot be contacted windows 10
  3. Double-click your internet adapter to open its window.
    Wi-Fi Status window the local security authority cannot be contacted windows 10
  4. Click the Properties button.
  5. Select Internet Protocol Version 4, and then click the Properties button.
    Wi-Fi Properties the local security authority cannot be contacted windows 10
  6. Select the Use the following DNS server address radio button.
    Internet Protocol Version 4 window the local security authority cannot be contacted windows 10
  7. Enter the value 8.8.8.8 in the Preferred DNS server box.
  8. Then input 8.8.4.4 in the Alternative DNS server box.
  9. Click the OK button.

4. Check Group Policy’s Remote Desktop Services settings

Some users might need to enable Remote Desktop Services with the Group Policy Editor on client PCs.

  1. Launch the Run accessory.
  2. Enter gpedit.msc and click OK to open Group Policy Editor.
    Local Group Policy Editor the local security authority cannot be contacted windows 10
  3. Click Administrative Templates on the left side of Group Policy Editor.
  4. Then click Windows Components > Remote Desktop Services > Remote Desktop Services > Remote Desktop Session Host > Connections within the navigation pane.
  5. Double-click Allow users to connect remotely by using Remote Desktop Services to open the window for that policy.
  6. Select the Enabled radio button.
  7. Click Apply to save the new settings.
  8. Click OK to close the policy window.
  9. Restart Windows after enabling Remote Desktop Services.

4. Flush DNS Cache

  1. Some users have also resolved this issue by flushing the DNS cache. To do that, enter cmd in Windows 10‘s search box.
  2. Right-click Command Prompt and select Run as administrator on the menu.
  3. Click Yes if a UAC dialog box opens.
  4. Input this command:
    • ipconfig/flushdns.
  5. Press Enter to initiate that command.

ipconfig/flushdns commandthe local security authority cannot be contacted windows 10

Those are some of the resolutions users have fixed the local security authority error with. So, there’s a good chance that they’ll fix the same issue for you.

Let us know which of the solutions solved this issue for you by leaving us a message in the comments section below.

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