T400 Intel 5100 Cisco VPN Vista problem

Many people have encounter problem with Intel 5100 wireless and Cisco VPN under Vista. Depends on configuration (it looks like a DNS failure), some people can fix it with

- DNE update*

- disable IPv6, reinstall Intel driver, change ArpRetry etc.** Some also get the infamous "connection terminated locally by the client
Failed 442: Failed to enable Virtual Adapter" , or worse, the ndis.sys BSOD.

This is one scenerio for the Lenovo Thinkpad T400 with VPN Client

In the Network connections, you will see three icons for the wireless

- Intel (R) WiFi Link 5100 With PAN (with an wired connection icon instead of wireless)

- WiFi STA

- My WiFi PAN MUX-IM Virtual MiniPort Drive

if you look at the properties of each after installing Cisco VPN client, deterministic network is not bound to any of them


One solution is run the Intel PROSet/Wireless WiFi Software setup, uninstall the Intel(R) My WiFi Technology, Administrator Toolkit, WMI Support. (the last two may not be necessary)

DO NOT uninstall the entry above - "Intel PROSet/Wireless WiFi Software", otherwise it will remove your 802.1X's Cisco LEAP, PEAP-GTC, EAP-FAST, Intel EAP-SIM/TTLS/AKA plugins, and leave you with just Microsoft Smart Card, PEAP and Symantec NAC.

You should be back to just a single wireless instance.


once you add VPN, you get an wired connection icon for the virtual adapter also.

and deterministic network should bind to WiFi Link 5100.


* http://www.citrix.com/lang/English/lp/lp_1680845.asp

** http://social.technet.microsoft.com/Forums/en-US/itprovistaapps/thread/86f5d750-3b5b-4d83-8fa6-68a4cec4fedc,