I have a Router 1811 and a PIX 515E. Both are connected with a VPN tunnel.
Everything works OK but in times of inactivity the PIX deletes the connection and after that the remote site (Router) cannot start the VPN.
the PIX gives this message
710003: ESP access denied by ACL from "router IP"/12304 to PIXINTERF:IP/24081.
when i start communication from the local site everything is OK