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IOS Router to other VPN gateway - Encryption algorithm offered does not match policy

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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

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