Cisco VPN Concentrator and Checkpoint NG FP3 Tunnel Problem

[saimbt]

We had configured Site to Site VPN tunnel between Cisco VPN Concentrator and Checkpoint NG FP3.

It was working fine previously but now all of a sudden we started getting the error in Checkpoint as IKE: Information Exchaged Recieved Delete IPSEC-SA from Peer and now Tunnel is not coming up.

[ehirsel]

I would start by reexamining the vpn concentrator and Checkpoint configurations. Did any device have an interface ip address change? Was the concentrator and/or checkpoint device code not saved and then a reboot happened that caused the ipsec config info to disappear? Did someone accidentally turn-off site-to-site vpn functionality on any device (i.e., the tunnel type on the concentrator changed from lan-to-lan to remote-access)?

Let me know what you find and we can proceed from there.