I had to go through this process for Windows 7, 64 bit. I had to obtain devcon.exe by installing the Windows Driver Kit (WDK) and using the copy in 8.0 Tools x64. The more commonly found devcon.exe will fail with a terse, unhelpful message.

I installed each of these hardware ID's using 'devcon.exe install c: windows inf netrasa.inf ': MS_AgileVpnMiniport MS_NdisWanip MS_NdisWanipv6 MS_L2tpMiniport MS_ndisWanbh MS_PppoeMiniport MS_PptpMiniport MS_SstpMiniport After adding these, Device Manager showed them as 'Unknown Device'. After a reboot, Windows attempted to install drivers for these. It reported failure for each, but still, Device Manager showed the proper Display Name for each of the above. My first attempt at using VPN failed due to Network Access Protection (NAP) not getting info it wanted. The second attempt succeeded. After a straight run of 21hrs of searching/sifting through all the stupid windows helpdesk post and other blogs - Found all useless. Here is what worked for me: Re-install ing WAN miniport (IP) device - First restore the backup key you deleted from the registry - steps 3-6 were the culprits.

STEP -A - so before you start reinstalling - restore the registry key you might have saved before step 6 by exporting the key before delete. -just double click that backup file to autoinstall THis will bring back the entry in the device manager - albite with an unknown driver mark on the entry - goto Step B - Now the step 9 to 11 are all crap - windows does not allow you to access or change the netrasa.inf file. ACCESS DENIED!!!! - instead you just need to follow some simple steps STEP -B - Now just scan for any hardware changes - windows automatically updates the WANminiport IP driver using the files windows/system32/ndistapi.sys & windows/system32/ndiswan.sys - otherwise you might have to locate this directory for the install to happen This works!!!! And wallah!!! Your netcon is back online:).

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Jun 9, 2011 - Here are the steps to re-install WAN miniport devices. Repeat this process for all miniport devices that you need to. Im using windows 8. May 08, 2013  I have exactly the same issue with a Lenovo X1 Carbon with Wndows 8 Pro 64 bits and it came from Factory with the issue. One came up with a yellow exclamation mark WAN Miniport.

If some one has 301 Error: 'This device is not working properly because Windows can not load the correct driver for it. (Code 31)' Here is the manual how to fix • Open the Device Manager. • Right-click mini-WAN port (Network Monitor) • Click Update Driver. • Select Search for drivers on this computer • Select Choose from a list of device drivers on my computer • Clear the checkbox Show compatible hardware • Select any other driver. (Eg network adapter Hyper-V) • Click OK on the warnings. • In the end, the driver must be established. Podpisatj drajver windows 7 x64 dseo. Once this happens, right-click on the device again and select Remove.