I have setup a VPN between and ASA5505 and a PIX 501. It seems as though the VPN is "on demand" meaning if I don't use the connection to the far end private network, the connection dies and is restarted when I try to initiate connectivity back to the private network. I have two other VPNs that are connected to Cyberguards that don't exhibit this behavior. I am sure I am missing something, but how would I configure the ASA/PIX tunnel to stay up continuously.
I have this problem too.