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client not connecting to VPN on 871w

I've configured a VPN server on my 871w using IPSec over UDP. I've done this using the SDM. When I try to open a connection using the latest client (5.0), I get these messages in the log:

Cisco Systems VPN Client Version 5.0.01.0600

Copyright (C) 1998-2007 Cisco Systems, Inc. All Rights Reserved.

Client Type(s): Windows, WinNT

Running on: 6.0.6000

Config file directory: C:\Program Files\Cisco Systems\VPN Client\

1 15:17:54.811 08/26/07 Sev=Warning/2 IKE/0xE300009B

Invalid SPI size (PayloadNotify:116)

2 15:17:54.811 08/26/07 Sev=Warning/3 IKE/0xA3000058

Received malformed message or negotiation no longer active (message id: 0x00000000)

The only answers I can get so far from my research is that:

1) The group name/password are wrong, which I know is not possible.

2) I need to forward (UDP) ports 500 and 4500 on the 871w firewall.

If it's the port forwarding I need, how can I forward these ports for a network range, instead of just one static host IP? Thanks in advance.

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