Since I upgraded
my system to windows 8.1, I continuously get the problem of VPN not getting
connected due to corrupted WAN mini port (Indicated by yellow exclamatio n mark in Device Manager). This lead my formatting my system couple of
times but finally I able to find the resolution. Please perform the steps
below:
- Open Device Manager.
- In network adapters section, you will find WAN mini port devices (IP, L2TP, PPTP).
- You can observe the broken mini port my observing the yellow exclamation mark in front of them.
- In case WAN mini-ports are not listed try by selecting the option “See hidden devices” from menu.
- Got Registry editor and browse to HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet->Control->Class->{4D36E972-E325-11CE-BFC1-08002BE10318}
- Go through each of the sub keys to find the sub key corresponding to the broken mini-port. This information can be seen in the DriverDesc value.
- Once you got the key corresponding to broken mini-port, delete the sub key.
- For reinstalling the WAN mini-port go to Device Manager.
- Select broken mini-port.
- Right click the selected broken mini-port and select ‘Update Driver Software’
- On Next screen select the option of Browse my computer for driver software.
- On Next screen select the option of ‘Let me pick from a list of device drivers on my computer’
- Select the only network adapter listed there and click next.
- After successfully installing the driver you will observe the yellow exclamation mark is gone in device manager and mini-port is fully recovers.
- Repeat the steps 9 to 14 for all the broken mini ports,