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Cisco VPN Client with Iphone 3GS IOS 5.0.1

Hi, I just got an Iphone 3GS 32GB with IOS 5.0.1 and I can't establish the tunnel with the embeded Cisco VPN  Client. My older Iphone with IOS 3.x.x worked fine with the embeded Cisco Vpn Client.

Main difference : the IOS5.x.x requires a Xauth authentication. Consequently, in addition to the VPNGroup name and VPNGroup password, I created in my Pix 501 6(3) a username with a password.

After adjusting the Pix config for Xauth on the crypto dynamic-map, the connection goes until the Pix requests the Username and Password. Right after entering the username and the password, the process abort on error.

Can anyone help ?

The 2 files are listings from the debug crypto isakmp on the Pix. I did two logs :

- PC log = VPN Client on a PC with WinXP to the Pix

  - Iphone = VPN Client on the Iphone to the Pix.

Both use the same Group and User names and passwords.

Last info : the Pix is in the DMZ of the Adsl Box

Thanks in advance