We have a VPN up to a ASA5520. The tunnel connects and stays up, but after a few minutes we lose the ability to browse the intranet servers behind the 5520.
If i disconnect the tunnel and then reconnect, the intranet comes back but we lost it after a few minutes go by.
Both keys lifetimes match on both sides.
Any ideas on where to start looking first? Is this a network issue rather than VPN?