VPN tunnel not established when trying it between NGX R65 and Cisco PIX

Hi
I have Nokia IP 390 an dNGX R65 installed on. Last week i've configured VPN site to site between us and our customer in US , they have CISCO PIX.
VPN configuration:
IKE Phase 1 : AES-256, MD5
IPsec Phase 2 : AES-256, MD5
We are using shared secret for this VPN Community.
Advanced VPN configuration:
IKE Phase 1 : DH group = group 5 (1536 bit)

All configuration the same on other side (on PIX) according customer's IT.

There is three Smartview tracker logs that i see when trying establish the tunnel:

1.
Number:                           446405
Date:                                 6Jul2008
Time:                                14:23:47
Product:                            VPN-1 Power/UTM
Interface:                           eth3c0
Origin:                              XXXXX (The name of our firewall object)
Type:                                Log
Action:                              Encrypt
Protocol:                           udp
Service:                            IKE (500)
Source:                             XXXXX (The name of our firewall object)
Destination:                      XXXXX (The name of customer firewall object)
Rule:                                 4
Current Rule Number:      4-Standard
Source Port:                     IKE
Information:                      service_id: IKE
Community:                      NameOfVPNCommunity
Encryption Methods:         ESP: AES-256 + MD5
Encryption Scheme:         IKE
Rule UID:                          {07736A1B-C94F-4066-A4AB-D875F1EF395F}
SmartDefense Profile:       No Protection
Subproduct:                      VPN
VPN Feature:                    VPN
VPN Peer Gateway:           XXXXX (The name of customer firewall object)
Policy Info:                       Policy Name: Standard
                                         Created at: Sun Jul 06 13:40:19 2008
                                         Installed from: FW_MANAGER

2.
Number:                           446906
Date:                                6Jul2008
Time:                                14:24:51
Product:                           VPN-1 Power/UTM
Interface:                          eth3c0
Origin:                              XXXXX (The name of our firewall object)
Type:                                Log
Action:                             Drop
Protocol:                          udp
Service:                            IKE (500)
Source:                            XXXXX (The name of our firewall object)
Destination:                      XXXXX (The name of customer firewall object)
Source Port:                     IKE
Information:                     encryption fail reason: Received a cleartext packet within an encrypted connection
SmartDefense Profile:      No Protection
Policy Info:                       Policy Name: Standard
                                        Created at: Sun Jul 06 19:18:29 2008
                                        Installed from: FW_MANAGER

3.
Number:                           447034
Date:                                6Jul2008
Time:                                14:25:03
Product:                           VPN-1 Power/UTM
Interface:                          eth3c0
Origin:                              XXXXX (The name of our firewall object)
Type:                                Log
Action:                             Drop
Protocol:                          udp
Service:                            IKE (500)
Source:                            XXXXX (The name of our firewall object)
Destination:                      XXXXX (The name of customer firewall object)
Source Port:                     IKE
Information:                     encryption fail reason: Packet is dropped because there is no valid SA - please refer to solution sk19423 in SecureKnowledge Database for more information
SmartDefense Profile:      No Protection
Policy Info:                       Policy Name: Standard
                                        Created at: Sun Jul 06 19:18:29 2008
                                        Installed from: FW_MANAGER

eth3c0 - this the external interface of our box.
The external IP address of our firewall object is configured properly (that might the problem for cleartext through encrypted connection), so that not a problem.

Any idea?

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