Windows 7: VPN question by bluetooth

Hi，
I have a very difficult problem to handle. It is the following:
I have realized the internet access in my Thinkpad(T400 for Windows 7 Pro) through my mobile phone（3G) by bluetooth 。the
problem appears in the next step:
I want to access my office network by VPN in my
T400 ,so I installed VPN client (Checkpoint VPN-1 Secureclient )。I first validated the VPN connection was OK through ADSL and WIFI. I could access some computer in my office network by VPN. but VPN connection was not OK through the bluetooth above. VPN log was the following:
"Connecting to gateway...
Gateway not responding
Connection failed"
I found a strange appearance,I compared to the connection properties between the WIFI and bluetooth. In Wifi property,the "checkpoint securemote" was bound.As shown in the figure：
but in the bluetooth connection,the "checkpoint securemote" was not bound.As shown in the figure：
Whether the "checkpoint securemote" not bound is the reason of VPN connection failure,How to bind it on the bluetooth connection?
thank you a lot.