We're having problems with IPSec tunnels going down and not coming back up by themselves since the upgrade to 7.x. We never had this problem on 6.x, and connections to other manufacturers' VPN devices as well as IOS devices appear to be affected.
We have this configured for the tunnel-attributes:
isakmp keepalive threshold 30 retry 2
But it does not seem to help. The Pix also reports that the command is deprecated, but does not provide an alternative.
On the IOS side, we have this configured:
crypto isakmp keepalive 30 2 periodic
Any ideas how we can resolve this short of reverting to 6.x?