Specified port is unknown

**Anilrgowda** · 15-Feb-2007, 01:05 AM

Question: We are using xp pro sp2 and have a brother hl-2030 printer connected via a usb connection. This was working OK, but suddenly the printing stopped working.
We romoved all of the printer drivers and tried to re install, but the hardware is detected and the drivers seem to install, but we keep getting an error message saying there was a problem installing the hardware as the "specified port is unknown".
We have tried a differnet printer, and exactly the same thing happens.

We have removed the USB ports from device manager and re installed them again, but still no joy.

We have tried installing the drivers manually, but the USB port option is not there.

Does anyone have any ideas.

**Anilrgowda** · 15-Feb-2007, 01:05 AM

A slight possibility could be a "phantom" driver. Windows keeps some information even when the hardware no longer is connected. So to add a little to LeeTutor's post, go to a command prompt and type the following.

set DEVMGR_SHOW_NONPRESENT_DEVICES=1
Devmgmt.msc

Once device manager is open, again select "Show hidden devices" The difference now will be that you should be able to see any device whether it's currently loaded or not, and should more fully allow you to clean out all USB devices

15-Feb-2007, 01:05 AM	#1 (permalink)
Anilrgowda Administrator Posts: 18,715 Join Date: Jan 2006 Rep Power: 10 IM:	Specified port is unknown Question: We are using xp pro sp2 and have a brother hl-2030 printer connected via a usb connection. This was working OK, but suddenly the printing stopped working. We romoved all of the printer drivers and tried to re install, but the hardware is detected and the drivers seem to install, but we keep getting an error message saying there was a problem installing the hardware as the "specified port is unknown". We have tried a differnet printer, and exactly the same thing happens. We have removed the USB ports from device manager and re installed them again, but still no joy. We have tried installing the drivers manually, but the USB port option is not there. Does anyone have any ideas.

15-Feb-2007, 01:05 AM	#2 (permalink)
Anilrgowda Administrator Posts: 18,715 Join Date: Jan 2006 Rep Power: 10 IM:	Re: Specified port is unknown A slight possibility could be a "phantom" driver. Windows keeps some information even when the hardware no longer is connected. So to add a little to LeeTutor's post, go to a command prompt and type the following. set DEVMGR_SHOW_NONPRESENT_DEVICES=1 Devmgmt.msc Once device manager is open, again select "Show hidden devices" The difference now will be that you should be able to see any device whether it's currently loaded or not, and should more fully allow you to clean out all USB devices

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