Group Membership Caching - Solution for VPN available?

1.) Remote User connected via VPN

2.) Run gpresult on client and check user group membership

3.) Add User on your AD controller to a new group

4.) Run gpupdate /force on the remote machine

5.) Run gpresult again

As you can see Group Membership will no be updated. Membership refresh only

happens during logon to the machine (not possible here, VPN User is using a

software certificate for auth which is only available to the user after

logon).

QUESTIONS:

1.) Is there a solution available to trigger the client to update Group

Membership Caching?

2.) Is this a known issue and solved with Vista?

Thanks a lot,

Herbert