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Troubleshooting a Windows Hamachi Client Failing to Connect to the Hamachi Engine


    You see the following error

    Failed to connect to engine.


    This indicates the failure of the Hamachi service.


    1. Press the Windows key and the R key on your keyboard to open the Run window.
    2. Type services.msc, and press Enter.
    3. Right-click on LogMeIn Hamachi Tunneling Engine and select Restart.

      Result: The status of the service changes to Started.

    What to do next:
    If the LogMeIn Hamachi Tunneling Engine service does not start, you must edit the Windows registry.
    CAUTION: Editing the Windows registry incorrectly may stop other applications from working correctly.
    1. Press the Windows key and the R key on your keyboard to open the Run window.
    2. Type regedit, and press Enter to open the Registry Editor.
    3. Select the HKEY_LOCAL_MACHINE\SOFTWARE\LogMeIn Hamachi entry.
      Note: On Windows 11, select Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\LogMeIn Hamachi
    4. Right-click on an empty line and select New > String Value.
    5. Name the new key as EngineConfigDir.
    6. Double-click on the EngineConfigDir key and in the Value field, enter a location on your computer to store the necessary configuration files. Hamachi creates the configuration files automatically.
    7. Restart the LogMeIn Hamachi Tunneling Engine as described above.
    Important: If your anti-virus software reports or blocks Hamachi-2-ui.exe, you must add an exclusion for the Hamachi-2-ui.exe program. Please consult your anti-virus software documentation for assistance with adding an exclusion to the allowed list.
    Article last updated: 3 October, 2022