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COM Port Errors

COM port unavailable

  • The computer may have been started with a different VBOX connected to it. Disconnect the VBOX and restart the computer before reconnecting the VBOX.
  • Another software package installed on your computer may have reserved the COM port.

How to Delete/Clear COM Ports in use

If you start to experience trouble with COM Ports then the steps below will allow you to clear out your COM ports.

 

com_error1.JPG

 

One thing is to see if hidden devices are taking up the ports:
Click Start > All Programs > Accessories and then click Command Prompt.


Type set devmgr_show_nonpresent_devices=1 in the Command Prompt and then press Enter.
(you may need to restart your computer)


Type start devmgmt.msc in the Command Prompt and then press Enter.

Click View > Show hidden devices. This will display devices that are not connected to your computer.


Expand COM ports. Uninstall all from this list. (Right click, Uninstall)

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Last modified
11:09, 3 Jul 2015

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