ID #1192

Problem While installing Printer driver when USB printer is plugged in.

PROBLEM : While installing Printer driver following error was appearing when USB printer is plugged in.

 “the specified port is unknown”




  1. 1.      Open Registry Editor.
  2. 2.      Go to following path


Check if a subkey with the name USB Monitor exists. If not, create it, by right-clicking Monitors and selecting New > Key. Name that key USB Monitor.

Now right-click in the right pane and select New > String Value from the menu. Enter Driver as the name. Double-click driver and enter usbmon.dll as the value.

Now restart your computer and perform the printer installation again. It should resolve the problem.

Tags: -

Related entries:

You can comment this FAQ