Cisco VPN clients unable to connect to 3725 VPN server

I have a 3725 router that is acting as a VPN server as well as a
performing NAT for the internal network. The VPN is setup to connect
to another remote network and to allow clients to connect securely to
the router and access the local network

The problem is the client is prompted for the user name and password
but it won't establish the connection so I'm not sure what's missing.
Any help would be greatly appreciated.

The only error I get is:
Jan 18 18:21:06.319: %CRYPTO-6-IKMP_MODE_FAILURE: Processing of Quick
mode failed with peer at 172.16.2.4

Here's the config:
!
! Last configuration change at 13:30:31 PCTime Fri Jan 18 2008 by
rsreese
! NVRAM config last updated at 13:30:34 PCTime Fri Jan 18 2008 by
rsreese
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname 3725router
!
boot-start-marker
boot-end-marker
!
no logging buffered
enable secret 5 $1$BUZ8$sNjxnHHht1NP3co5Vkj2o0
!
aaa new-model
!
!
aaa authentication login default local
aaa authentication ppp default local
aaa authorization exec default local
aaa authorization network default local
!
aaa session-id common
clock timezone PCTime -5
clock summer-time PCTime date Apr 6 2003 2:00 Oct 26 2003 2:00
no network-clock-participate slot 1
no network-clock-participate slot 2
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 172.16.2.1
ip dhcp excluded-address 172.16.3.1
!
ip dhcp pool VLAN2clients
network 172.16.2.0 255.255.255.0
default-router 172.16.2.1
dns-server 205.152.144.23 205.152.132.23
!
ip dhcp pool VLAN3clients
network 172.16.3.0 255.255.255.0
default-router 172.16.3.1
dns-server 205.152.144.23 205.152.132.23
!
!
ip domain name neocipher.net
ip name-server 205.152.144.23
ip name-server 205.152.132.23
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
vpdn enable
!
vpdn-group 1
! Default L2TP VPDN group
accept-dialin
protocol l2tp
virtual-template 1
no l2tp tunnel authentication
ip pmtu
!
vpdn-group L2TP_VPN
accept-dialin
protocol l2tp
virtual-template 1
no l2tp tunnel authentication
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
username rsreese privilege 15 secret 5 $1$k.mV$065vhIx6xkX.kM6jxTAOM.
!
!
ip ssh authentication-retries 2
!
!
crypto isakmp policy 3
encr 3des
authentication pre-share
group 2
!
crypto isakmp policy 10
hash md5
authentication pre-share
crypto isakmp key cisco address 10.0.0.2 no-xauth
!
crypto isakmp client configuration group VPN-Users
key test00
dns 205.152.144.23 205.152.132.23
domain neocipher.net
pool VPN_POOL
acl 115
include-local-lan
netmask 255.255.255.0
!
!
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
mode transport
!
crypto dynamic-map DYNMAP 10
set transform-set ESP-3DES-SHA
match address 115
!
!
crypto map CLIENTMAP client authentication list default
crypto map CLIENTMAP isakmp authorization list default
crypto map CLIENTMAP client configuration address respond
crypto map CLIENTMAP 1 ipsec-isakmp
set peer 10.0.0.2
set transform-set ESP-3DES-SHA
match address 100
crypto map CLIENTMAP 10 ipsec-isakmp dynamic DYNMAP
!
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
ip address dhcp client-id FastEthernet0/0 hostname 3725router
ip nat outside
ip virtual-reassembly
speed 100
full-duplex
crypto map CLIENTMAP
!
interface Serial0/0
ip address 10.0.0.1 255.255.240.0
clock rate 2000000
crypto map CLIENTMAP
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
!
interface FastEthernet0/1.2
encapsulation dot1Q 2
ip address 172.16.2.1 255.255.255.0
ip nat inside
ip virtual-reassembly
crypto map CLIENTMAP
!
interface FastEthernet0/1.3
encapsulation dot1Q 3
ip virtual-reassembly
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
interface Virtual-Template1
ip unnumbered FastEthernet0/0
peer default ip address pool PPTP-POOL
no keepalive
ppp encrypt mppe auto required
ppp authentication pap chap ms-chap
!
ip local pool PPTP-POOL 172.16.20.25 172.16.20.35
ip local pool VPN_POOL 192.168.0.55 192.168.0.105
ip default-gateway 192.168.1.1
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.1.1
ip route 172.16.10.0 255.255.255.0 10.0.0.2
!
!
no ip http server
ip http authentication local
ip http secure-server
ip http timeout-policy idle 600 life 86400 requests 10000
ip nat inside source route-map NONAT interface FastEthernet0/0
overload
!
access-list 100 permit ip 172.16.2.0 0.0.0.255 172.16.10.0 0.0.0.255
access-list 115 permit ip 192.168.0.0 0.0.0.255 172.16.0.0 0.0.255.255
access-list 120 deny ip 172.16.0.0 0.0.255.255 192.168.0.0 0.0.0.255
access-list 120 permit ip 172.16.0.0 0.0.255.255 any
!
route-map NONAT permit 10
match ip address 120
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
password 7 05080F1C2243
transport input ssh
line vty 5 903
transport input ssh
!
ntp clock-period 17180664
ntp server 129.6.15.29 source FastEthernet0/0 prefer
!
end