Troubleshooting IPsec-VPN connection attempts

[#1]

Hello all, I am a new to fortigate and I have came into a dead end in my attempts to establish a successful ipsec vpn connection. I would really appreciate any help. On the fortigate unit an ipsec connection is configured as interface mode dialup-server, with certificate based authentication. From the client side forticlient is used with proper certificates installed and matched configuration. This is the output of the connection test: Now install tunnels into kernel: 1 sys_get_local_gwy() called: [in] remote gw: (gateway ip). [in] Next hop: 0.0.0.0 sys_get_local_gwy() called: [in] remote gw: (gateway ip). [in] Next hop: 0.0.0.0 sys_get_local_gwy() called: [in] remote gw: (gateway ip). [in] Next hop: 0.0.0.0 sys_get_local_gwy() called: [in] remote gw: (gateway ip). [in] Next hop: 0.0.0.0 End installing tunnels Got a kernel message Detect local gateway for peer: (gateway ip) sys_get_local_gwy() called: [in] remote gw: (gateway ip). [in] Next hop: 0.0.0.0 sys_get_local_gwy() called: [in] remote gw: (gateway ip). [in] Next hop: 10.0.0.138 Get sa_connect message...10.0.0.78->(gateway ip):500, natt_mode=0 Using new connection...natt_mode=0 Set connection name = (connection name). Tunnel 10.0.0.78 ---> (gateway ip):500,natt_en=1 is starting negotiation Will negotiate a normal SA (client' s certificate name) cert (client' s certificate name) found set_phase1_id(): RSA -> ID_DER_ASN1_DN and it holds on that last line.. This is the log messages from the fortigate unit: Message meets Alert condition date=2010-10-11 time=12:47:27 devname=(devname) device_id=(device_id) log_id=0101037128 type=event subtype=ipsec pri=error fwver=040004 vd=" root" msg=" progress IPsec phase 1" action=" negotiate" rem_ip=(client' s public ip) loc_ip=(gateway ip) rem_port=885 loc_port=500 out_intf=" wan2" cookies=" 23585904a0094a6a/0000000000000000" user=" N/A" group=" N/A" xauth_user=" N/A" xauth_group=" N/A" vpn_tunnel=" IPSec-VPN" status=failure init=remote mode=main dir=inbound stage=1 role=responder result=ERROR Message meets Alert condition date=2010-10-11 time=12:47:27 devname=(devname) device_id=F(device_id) log_id=0101037124 type=event subtype=ipsec pri=error fwver=040004 vd=" root" msg=" IPsec phase 1 error" action=" negotiate" rem_ip=(client' s public ip) loc_ip=(gateway ip) rem_port=885 loc_port=500 out_intf=" wan2" cookies=" 23585904a0094a6a/0000000000000000" user=" N/A" group=" N/A" xauth_user=" N/A" xauth_group=" N/A" vpn_tunnel=" IPSec-VPN" status=negotiate_error error_reason=peer SA proposal not match local policy peer_notif=N/A Any ideas for the possible reasons for this? How can I further, more granularly troubleshoot this? I know there are diagnose cli commands but they are not in the cli guide and from what I did try - I couldn' t get any output.

[Jan_Scholten]

I think the AES256 Bug was fixed in FortClient 4.2.1.255 For the Fortigate there was a Bugfix in 4.1.6(?), which fixes a Performance issues, when using AES encryption.

[#3]

I was using the latest forticlient, but the fortigate is v4.0,build0196,100319 (MR1 Patch 4), maybe an upgrade would solve this. Thanks