Cisco VPN Tunnel Drops every 60 secs

Hi,

I have a site to site VPN between a ASA 5520 and a 2801.  The connection has been setup for many
years and I have never had any problems.

However over the last few days the VPN Tunnel resets every 60 Secs causing a small "reconnection pause"
between subnets.  This happens even with a constant ping from both ends causing a "Request Timed Out"

The IKE Rekey is set to 28800, the idle Timeout is 30 Mins and the IPsec Rekey is 3600 secs.

I have tried deleting and recreating the tunnel and its stills drops and restarts every 60 secs.

Other tunnels stay up without any problems.

I'm guessing it's a mismatch in a ACL but wondered if there was a easier way to find out which one.

Can some give me a few areas to check.

Thank you in advance.
Mongo PeckAsked:
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JohnBusiness Consultant (Owner)Commented:
Perhaps try the following:

Make backups of the VPN router configuration files.

Then do hard resets of the modems and the VPN routers. Config the modems if need be, and restore the VPN configs.

See if a complete reset clears the problem.
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David PiniellaCommented:
Check your logs and see which side is closing or dropping the connection.

The cisco vpn troubleshooting commands may help if you think it's ACLs, http://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/5409-ipsec-debug-00.html but I would check your logs to see more before doing debugs.
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