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VPN Transparent Tunneling

Would appreciate some a assistance with a VPN issue that's driving me crazy!

I've configured the Cisco VPN on a SRP257W router. The VPN Client has been connecting without any issue on several machines. (Using IPSec over UDP)

We have a  new HP machine and I've configured the VPN Client with identical settings, but the client fails to connect at the point where it's "negotiating security polices".

If I modify the transport settings and uncehck the "Enable Transparent Tunneling" the connections initialises and the machine gets an IP address, but I can't ping any devices.

Log file

Cisco Systems VPN Client Version
Copyright (C) 1998-2010 Cisco Systems, Inc. All Rights Reserved.
Client Type(s): Windows, WinNT
Running on: 6.1.7601 Service Pack 1
Config file directory: C:\Program Files (x86)\Cisco Systems\VPN Client\

1      15:12:12.839  11/23/13  Sev=Warning/2 IKE/0xA3000067
Received Unexpected InitialContact Notify (PLMgrNotify:886)

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