Problem with Remote Access VPN terminated by Cisco ASA 5505

I'm having trouble getting a remote access VPN  to work properly. I'm using an ASA 5505 running 7.2.4. Here's the setup...

The ASA is behind a ADSL modem/router combo, but the modem passes all traffic. I am positive that all traffic entering the outside interface gets forwarded to the inside. The inside of the modem/router has the address 192.168.1.1. I have configured the ASA with outside interface 192.168.1.2 and set a default route to forward to 192.168.1.1. The inside of the ASA is 192.168.2.1.

I have set up a remote access vpn. When I test it, it fails to connect. I stay in the perpetual 'contacting the security gateway at...' state. If I turn off isakmp nat-traversal on the ASA, I am able to connect to the  VPN successfully; however, I am unable to pass traffic.

I thought for sure that this was a routing problem. I was testing the remote access from behind another 192.168.1.0/24 network. However, when I tried to connect from behind an entirely different subnet, I had the same results.

When I enable logging on the ASA, I see the message:
[IKEv1]: Group = RemoteAccess, IP = xx.x.x, Error: Unable to remove PeerTblEntry

What is going on here? I plan on replacing the modem/router combo with a modem. Will this fix it or is there something else going on?

ASA# sho run
: Saved
:
ASA Version 7.2(4)
!
hostname ASA
domain-name default.com
enable password XCBuNvamynPGu917 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan1
 no nameif
 no security-level
 no ip address
!
interface Vlan2
 no forward interface Vlan10
 no nameif
 no security-level
 no ip address
!
interface Vlan10
 nameif inside
 security-level 100
 ip address 192.168.2.1 255.255.255.0
!
interface Vlan11
 nameif outside
 security-level 0
 ip address 192.168.1.2 255.255.255.0
!
interface Ethernet0/0
 switchport access vlan 11
!
interface Ethernet0/1
 switchport access vlan 10
!
interface Ethernet0/2
 switchport access vlan 10
!
interface Ethernet0/3
 switchport access vlan 10
!
interface Ethernet0/4
 switchport access vlan 10
!
interface Ethernet0/5
 switchport access vlan 10
!
interface Ethernet0/6
 switchport access vlan 10
!
interface Ethernet0/7
 switchport access vlan 10
!
ftp mode passive
clock timezone cst -6
dns server-group DefaultDNS
 domain-name default.domain.invalid
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
access-list outside_in extended permit icmp any any echo-reply
access-list outside_in extended permit icmp any any time-exceeded
access-list outside_in extended permit icmp any any unreachable
access-list RemoteAccess_splitTunnelAcl standard permit 192.168.2.0 255.255.255.
0
access-list inside_nat0_outbound extended permit ip 192.168.2.0 255.255.255.0 19
2.168.200.0 255.255.255.240
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool VPNpool 192.168.200.1-192.168.200.11 mask 255.255.255.0
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-524.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 0.0.0.0 0.0.0.0
access-group outside_in in interface outside
route outside 0.0.0.0 0.0.0.0 192.168.1.1 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
http server enable
http 192.168.2.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto dynamic-map outside_dyn_map 20 set pfs
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-SHA
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
 authentication pre-share
 encryption 3des
 hash sha
 group 2
 lifetime 86400
crypto isakmp policy 65535
 authentication pre-share
 encryption 3des
 hash sha
 group 2
 lifetime 86400
crypto isakmp nat-traversal  20
telnet timeout 5
ssh timeout 5
console timeout 0
 
ntp server 129.6.15.28
group-policy RemoteAccess internal
group-policy RemoteAccess attributes
 vpn-tunnel-protocol IPSec
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value RemoteAccess_splitTunnelAcl
username fac password ESl4cXhAb7HpWykT encrypted privilege 0
username fac attributes
 vpn-group-policy RemoteAccess
tunnel-group RemoteAccess type ipsec-ra
tunnel-group RemoteAccess general-attributes
 address-pool VPNpool
 default-group-policy RemoteAccess
tunnel-group RemoteAccess ipsec-attributes
 pre-shared-key *
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect netbios
  inspect rsh
  inspect rtsp
  inspect skinny
  inspect esmtp
  inspect sqlnet
  inspect sunrpc
  inspect tftp
  inspect sip
  inspect xdmcp
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:2383e6aba8e9627f1ac163e61a34fbb2
: end

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