SSG5 Vpn Konfigurasyon

merhaba asagıdaki konfigurasyona gore vpn ayarlaması yaptım fakat baglantı saglayamadım nerede yanlıs yaptım ısın ıcınden cıkamadım

tesekkurler 

1. Create user "vpnuser" in Objects > Users > Local.  User Name: vpnuser.  Status: Enable.  IKE User: Checked.  Simple Identity: Selected.  IKE ID Type: Auto.  IKE Identity: vpnuser.  Authentication User: Checked.  User Password and Confirm Password: Both specified.

2. Create new "vpngw" gateway in VPNs > AutoKey Advanced > Gateway.  Gateway Name: vpngw.  Security Level: Custom.  Dialup User: vpnuser.  Preshared Key: Specified.

3. Modified advanced settings for "vpngw" gateway.  Security Level, User Defined, Custom: Selected.  Phase 1 Proposal: rsa-g2-aes128-sha, dsa-g2-aes128-sha.  Mode (Initiator): Aggressive.

4. Created new VPN "vpn" in VPNs > AutoKey IKE.  VPN Name: vpn.  Security Level: Custom.  Remote Gateway, Predefined: vpngw.

5. Modified advanced settings for "vpn".  Security Level, User Defined, Custom: Selected.  Phase 2 Proposal: g2-esp-aes128-sha.  Replay Protection: Checked.  VPN Monitor: Checked.

6. Added Policy from Untrust to Trust.   Source Address, Address Book Entry: Any.  Destination Address, Address Book Entry: Dial-Up VPN.  Action: Tunnel.  Tunnel, VPN: vpn.  Tunnel, Modify matching bidirection policy: Checked.  Logging: Checked.

7. Verify Policy from Trust to Untrust.  (Automatically generated by checked the "Modify matching bidirection policy" mentioned above.)  Source Address, Address Book Entry: Dial-Up VPN.  Destination Address, Address Book Entry: Any.  Action: Tunnel.  Tunnel, VPN: vpn.  Logging: Checked.

8. Create VPN client connection on my Mac (using Mac OS X 10.5) in System Preferences > Network and click "+" button ("Create a new service") to add VPN (L2TP).

9. Configure connection.  Add configuration by clicking Configuration > New Configuration.  Specified external IP address of router and username "vpnuser".  In "Authentication Settings," added user password and shared secret.

10. Click "Apply", then "Connect."

When I connect, it simply tells me it can't do so, after trying for a few seconds.  When I check the file "ppp.log" in Console.app, I only get the following details, which are not helpful:

Sat Aug  2 16:39:12 2008 : IPSec connection started
Sat Aug  2 16:39:22 2008 : IPSec connection failed

I tried following a tutorial for setting a VPN up with certificates which I found on this site, but it didn't work.  (After generating a certificate using the router's CSR, I get no means to specify the certificate is for a VPN server.)