Core issue
On the router, the following debug messages are displayed during the phase 1 negotiation.
Encryption algorithm offered does not match policy
atts are not acceptable
Resolution
The above errors mean that the remote VPN gateway is not configured with the correct encryption algorithm (DES/3DES), so it does not match the policy.
To fix the problem, configure the Internet Security Association and Key Management Protocol (ISAKMP) policies on both end points with the same parameters.
Problem Type
Connectivity to the device
Product Family
Routers
Cisco IOS Software Version
12.0
12.1
12.2
