Hello gurus of the list,

I've been trying for the past 4 hours to setup a VPN between a
SecureComputing Sidewinder (SCSD) and a CP FW-1 CP2000 v4.1 SP3 (FW)
without luck. This is supposed to be a VPN between 2 Networks (how
obvious). I've setup a Network object for their end, say NET-A
(10.0.0.0/16) and a Network Object for my end, say NET-B
(172.24.0.0/24). I've setup 2 rules allowing the IPSEC Group of services
(AH, ESP, IKE, ISAKMP, SKIP) one to allow traffic to my FW from their
SCSD and one to allow traffic from my FW to their SCSD:
FW -> SCSD -> IPSEC -> Allow
SCSD-> FW -> IPSEC -> Allow

I have also setup the encryption domains on the Network Objects as
following:
FW -> Other:NET-B
SCSD -> Other:NET-A

My FW is defined as a Workstation (Type: Gateway), (VPN-1 & Firewall-1),
(Version 4.1), (Management Station). The SCSD is defined as a
Workstation (Type: Gateway). I have also setup the VPN properties of the
FW as (IKE, DES, MD5, Pre-Shared Secret, Support keys exchange for
Subnets) and the VPN properties of the SCSD as (IKE, DES, MD5,
Pre-Shared Secret, Support keys exchange for Subnets). Finaly, I've
setup ONE rule as:
NET-A-> NET-B-> ICMP-> Encrypt
NET-B-> NET-A-> ICMP-> Encrypt and the encryption properties as IKE,
Encryption + Data Integrity (ESP), DES, MD5, Allowed Peer Gateway
(SCSD).

The guy from the SCSD side has setup the following:
General Tab
Encapsulation: Tunnel
Burb: Internal
Mode: Fixed IP
Remote IP: my REAL FW Internet IP
Client Address Pool: Disabled
Local Network IP: 10.0.0.0/16
Remote Network IP: 172.24.0.0/24

Authentication Tab
Authentication Method: Password

Crypto Tab
IPSEC Crypto Algorithms
Accept DES
IPSEC Hashing Algorithms
HMAC-MD5-96

Advanced Tab
Phase 1 (ISAKMP) Rekey
Hard Limits: 86400 sec (the same in minutes as my FW)
0 kb
P1 Crypto: DES
P1 Hash: MD5
P1 Oakley: Group 2
Soft Percentage: 85

Phase 2 (IPSEC) Rekey
Hard Lifetimes: 3600 sec (same as mine)
Soft Percentage: 85
0 KB

I can see in my logs that Phase-1 completes OK (IKE Log: Phase 1
completion. DES/MD5/Pre shared secrets Negotiation Id: and various
letters-numbers). But after 2-3 seconds I see the exact same entry but
with a different Negotiation Id and when I try to ping the remote host
to get the VPN up and running I get a icmp-type 8 icmp-code 0 encryption
failure: no response from peer scheme: IKE. I am a bit puzzled over
here. Does anyone has an idea of what might be wrong. Have any of you
guys and gals out there had any luck so far in a VPN between a
Sidewinder and a FW-1. If so, could you pretty please tell me what to
do. Thank you all and sorry for my lengthy e-mail.

Cheers,

Dimitris

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