Hi Guys,

my ipsec tunnel between R5 and the VPN3K fails with the following error message on r5:

%CRYPTO-4-IKMP_BAD_MESSAGE: IKE message from 163.1.112.11 failed its sanity check or is malformed
Jan 13 09:49:03.228: ISAKMP:(0:3:SW:1):incrementing error counter on sa: PAYLOAD_MALFORMED


the messages on VPN3K are as follows:

PHASE 1 COMPLETED

634 01/13/2008 10:49:01.340 SEV=4 AUTH/22 RPT=11 150.1.5.5
User [150.1.5.5] Group [150.1.5.5] connected, Session Type: IPSec/LAN-to-LAN

635 01/13/2008 10:49:01.340 SEV=4 AUTH/84 RPT=8
LAN-to-LAN tunnel to headend device 150.1.5.5 connected

636 01/13/2008 10:49:03.630 SEV=3 IKE/0 RPT=8 150.1.5.5
Group [150.1.5.5]
Rxed Encrypted Notify without a message Id!

637 01/13/2008 10:49:42.700 SEV=4 IKE/123 RPT=9 150.1.5.5
Group [150.1.5.5]
IKE lost contact with remote peer, deleting connection (keepalive type: DPD)

639 01/13/2008 10:49:42.700 SEV=5 IKE/194 RPT=22 150.1.5.5
Group [150.1.5.5]
Sending IKE Delete With Reason message: Connectivity to Client Lost.



The certificates has been imported successfully on both devices:

here is the config from r5:

ip domain name labcologne.intern
crypto isakmp policy 10
encr 3des
hash md5
group 2
crypto isakmp identity hostname
crypto ipsec transform-set 3DES_MD5 esp-3des esp-md5-hmac
!
crypto pki trustpoint IE1
enrollment mode ra
enrollment url http://10.0.0.63:80/certsrv/mscep/mscep.dll
revocation-check crl
crypto map VPN local-address Loopback0
crypto map VPN 10 ipsec-isakmp
set peer 163.1.112.11
set transform-set 3DES_MD5
match address VLAN5_TO_VLAN112
interface Serial0/1/0.54 point-to-point
ip address 163.1.54.5 255.255.255.0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 CISCO
frame-relay interface-dlci 504
crypto map VPN
!
interface Serial0/1/1
ip address 163.1.45.5 255.255.255.0
encapsulation ppp
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 CISCO
clockrate 64000
crypto map VPN
ip access-list extended VLAN5_TO_VLAN112
permit ip 10.5.5.0 0.0.0.255 192.10.1.0 0.0.0.255
ntp server 10.0.0.63


thanx in advance for any help

kr toxic