We had a problem today with a 3002 talking to a 3000 concentrator.
The IPsec tunnel kept bouncing up and down (connected for 5 seconds) then fixed itself after about an hour.
The logs show the following message being repeated:
Sending IKE Delete With Reason message: Administratively Disconnected.
Searches of the available documentation show that this is an expected reason code but I can not seem to find out what is actually happening and why the disconnect would occur.
Any replies indicating the ISP might be at fault will be especially appreciated.