A Local connection could not be established

Published: 2006-08-24


Last Updated: 2010-07-26

Applies To


When attempting to download a PIPE via Direct Downloader


When attempting to download a Mobile Downloader


When attempting to download a locally-connected Modem Downloader


You receive the following error:






If you are using a Serial cable, check your COM port settings.


This error most often occurs when someone moves the Downloader's USB cable from one port on the PC to another. The USB cable is actually a USB-to-Serial adapter. The COM port number for the USB cable is assigned by the PC when the USB cable is attached. Moving the USB cable to a different USB port will result in a different COM port number being assigned, and Guard1 Plus will no longer be able to communicate with the Downloader.


If you disconnect the USB cable from the PC for any reason, make sure you reconnect it to the same USB port. If you need to move the cable to a different USB port permanently there are two methods to reestablish communication with the Downloader:

  1. Delete your Downloader from the System Tab in Guard1 Plus and re-add it using the Add Devices Wizard to ensure it's configured for the new COM port.
  2. Change the Downloader's COM port setting to match the new COM port assigned to the cable:
    1. Right-click My Computer (Computer in Windows Vista & 7) and select Manage.
    2. In the left column, under System Tools, click Device Manager.
    3. In the right column, expand the Ports (COM & LPT) folder.
    4. Locate the entry for Prolific USB-to-Serial Comm Port (COM#). Note the number at the end.
    5. Launch Guard1 Plus
    6. Click the System Tab.
    7. Under Downloaders, double-click your Direct Downloader to open its Properties Tab in the right window pane.
    8. On the Properties Tab, change the COM Port setting to match the COM number of the Prolific USB-to-Serial Comm Port from Step 4.
    9. Click on the Save icon at the top of the Properties Tab.
    10. Remove your PIPE from the Downloader (if applicable).
    11. Place the PIPE back in the Downloader and attempt to download again.


If the error recurs, verify that you do not have a synchronization utility such as Blackberry Desktop Manager, Palm HotSync or Microsoft ActiveSync running. These types of utilities can "hijack" the COM port and prevent Guard1 Plus from communicating with the Downloader. A symptom of this is that the Downloader's Data LED flickers or is on steadily. The only time this LED should illuminate is when Guard1 Plus is communicating with the Downloader. If the Data LED is illuminated, either another application is trying to use the COM port, there is a problem with the physical port on the PC, or there is a problem with the PIPE that is currently docked. Contact Technical Support.