I have a Cisco ASA 5520 running software version 8.0(4), which serves as an endpoint for quite a few IPSec L2L-tunnels, and as an endpoint for up to 300 simultaneous VPN clients. Most of the clients use Cisco VPN Client, but 64-bit Windows-users - and 32-bit users that can't get the Cisco VPN client to work - use L2TP/IPSec.

Some users - regardless of OS, I've heard the same for users of XP, Vista and 7 - complain that they get disconnected every now and then, and that sometimes they can't reconnect for the next 20 or so minutes, even though they are able to ping the VPN endpoint.

Is there something wrong with the setup on my ASA? Or is this a known bug in 8.0(4)?