VPN connection - one user cannot see internal network

It may be a client issue - reboot for that.
It may be a local firewall/protection suite issue, disable that.
It could be that the VPN server has a different split tunnel setting, but you ruled that out..
Could be the ASA has reached it limit, doubt it, but needed to reboot a few times in the past when not running the latest firmware. Updated the firmware and all is good.
Could be that he is seeing the network, but the application is not working.. Can you ping him?

I tried to connect with two different PC's at the users house.
i disabled Windows firewall - don't know if the speedstream has one - i will check that
25 IPSec licenses on the ASA.
could not ping him.

don't know enough about NAT T to try it. the pc at the users house was taken from our office, so i know that there is client protection enabled.

Depending on your ASA config, Nat traversal will be enabled or not, allowing you to VPN in via a NAT firewalled Client.
http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/l2tp_ips.html

Can you disable this client protection, or has it already been eliminated as a cause?

Maybe the clients need to configure port-forwarding on the slipstream?

maybe some one can look at my config. i tried to setup another user, and cannot get him to connect. now i have two users that cannot connect and three that can. there could be something wrong with the config, since this is the first ASA i have ever setup.

: Saved
:
ASA Version 7.2(3) 
!
hostname ciscoasa
domain-name default.domain.invalid
enable password 8Ry2YjIyt7RRXU24 encrypted
names
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 10.4.0.254 255.255.240.0 
!
interface Vlan2
 nameif outside
 security-level 0
 ip address x.x.x.x 255.255.255.0 
!
interface Vlan3
 nameif DMZ
 security-level 50
 ip address 172.31.4.254 255.255.255.0 
!
interface Ethernet0/0
 switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
 switchport access vlan 3
!
interface Ethernet0/3
 shutdown
!
interface Ethernet0/4
 shutdown
!
interface Ethernet0/5
 shutdown
!
interface Ethernet0/6
 shutdown
!
interface Ethernet0/7
 shutdown
!
passwd 2KFQnbNIdI.2KYOU encrypted
ftp mode passive
dns server-group DefaultDNS
 domain-name default.domain.invalid
access-list VPNTunnel_splitTunnelAcl standard permit any 
access-list inside_nat0_outbound extended permit ip any 10.4.0.224 255.255.255.224 
access-list inside_nat0_outbound extended permit ip any 172.31.4.0 255.255.255.0 
access-list DMZ_outbound extended permit ip host 172.31.4.127 host 10.4.0.39 
access-list DMZ_outbound extended permit ip host 172.31.4.127 host 10.4.0.12 
access-list DMZ_outbound extended permit ip host 172.31.4.127 host 10.4.0.13 
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
mtu DMZ 1500
ip local pool VPNPool 10.4.0.231-10.4.0.250 mask 255.255.240.0
no failover
monitor-interface inside
monitor-interface outside
monitor-interface DMZ
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-523.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 DMZ_outbound in interface DMZ
route outside 0.0.0.0 0.0.0.0 24.154.70.1 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 uauth 0:05:00 absolute
http server enable
http 10.4.0.0 255.255.240.0 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
telnet timeout 5
ssh timeout 5
console timeout 0
 
!
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 rsh 
  inspect rtsp 
  inspect esmtp 
  inspect sqlnet 
  inspect skinny 
  inspect sunrpc 
  inspect xdmcp 
  inspect sip 
  inspect netbios 
  inspect tftp 
!
service-policy global_policy global
group-policy VPNTunnel internal
group-policy VPNTunnel attributes
 dns-server value 10.4.0.12 
 vpn-tunnel-protocol IPSec 
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value VPNTunnel_splitTunnelAcl
 default-domain value YNG.DPPipino.com
username sgmikalowsky password c5gLZlklIFf5r9a5 encrypted privilege 0
username sgmikalowsky attributes
 vpn-group-policy VPNTunnel
username mjsandoe password 34yfuhEtoXftzqlf encrypted privilege 0
username mjsandoe attributes
 vpn-group-policy VPNTunnel
username mpconnelly password zWJFUXT7FwuCi1SS encrypted privilege 0
username mpconnelly attributes
 vpn-group-policy VPNTunnel
username whbaxter password eCtuA/0MCMYZ4AXN encrypted privilege 0
username whbaxter attributes
 vpn-group-policy VPNTunnel
username ejhetrick password nJqA9VEnYxnDSCGZ encrypted privilege 0
username ejhetrick attributes
 vpn-group-policy VPNTunnel
tunnel-group VPNTunnel type ipsec-ra
tunnel-group VPNTunnel general-attributes
 address-pool VPNPool
 default-group-policy VPNTunnel
tunnel-group VPNTunnel ipsec-attributes
 pre-shared-key *
prompt hostname context 
Cryptochecksum:51865ce5a2646dc4a4df24b6f7d31678
: end
asdm image disk0:/asdm-523.bin
no asdm history enable

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crypto isakmp nat-traversal worked!

but does this pose any security risks?