I've configured a VPN between 2 offices using two ASA 5505 v. 7.2(4) via IPSec
The problem is that randomly the VPN connection drops. It can be working fine for hours and then fail, while the rest it is working fine (internet)
The solution comes by reloading the system which will always work and the connection is back again.
The IkE is using 3Des encription, pre-share authentication and 86400secs lifetime.
I don't really know what to check, or how to monitor it. I have been using the ASDM monitoring tools to check the Ipsec/IKE connections, but obviously cannot determine what is causing the problem or how to start troubleshooting it.
At this point, I am using a ping that continously pings a remote computer, and when it fails, I receive a mail.
Thank you for your help!