Hello,
We are trying to configure a site-to-site VPN tunnel between our Cisco 3825 and our customer's Cisco 2621. Per our customer, their router is limited to transform set des/3des and sha/md5. We have configured all possible combinations but are still unable to get a successful connection. Phase 1 negotiates successfully but Phase 2 fails. Our router shows the following log:
614629: .Sep 20 14:09:53.578 CDT: IPSEC(validate_transform_proposal): transform proposal not supported for identity:
{esp-3des esp-md5-hmac }
614630: .Sep 20 14:09:53.578 CDT: ISAKMP:(0:1531:SW:1): IPSec policy invalidated proposal
614631: .Sep 20 14:09:53.578 CDT: ISAKMP:(0:1531:SW:1): phase 2 SA policy not acceptable! (local x.x.x.x remote y.y.y.y)
Thanks for the help!