Inactivity timeout for SonicWALL Pro 3060

Hi There,

I am running SonicWALL Enhanced version 3.0.0.10-41e on a SonicWALL Pro
3060. We are using Global VPN Client version 310_556. Under the
Firewall rule settings for the VPN connection, the TCP inactivity
timeout is set to 5 minutes. However, the connections never time out,
and stay up until manually terminated by the user. SonicWALL support
has not been able to help us with this. They suggested we drop back to
the client version 210_111, but we have seen no difference in behavior.
Any ideas? Thanks.