Aiuto vpn software di windows+pix 501. Non si connette.

[Balorin]

Salve a tutti, ecco il mio problema:
in una rete aziendale ho un router (non gestito da me,ma da eutelia) a cui è collegato un firewall pix 501, che a sua volta è collegato ad un server vpn (windows 2003 server) e dietro di esso c'è tutta la lan aziendale.
Il problema fondamentale è che se elimino il firewall ho una connessione vpn software perfettamente funzionante, nel momento in cui rimetto il firewall al suo posto non riesco a collegarmi in remoto con la vpn.
al momento sul firewall sono aperte le seguenti porte:

Source host Destination host interface service
any any inside ip

any any outside 1701udp

any any outside 500udp

any any outside ah (IP)

any any outside esp

l'ip inside del firewall è 192.168.1.1 l'ip del server vpn a cui devono arrivare i dati è 192.168.1.4
Come faccio a fare in modo che i dati passino??
Aiuto plz

-edit-
tutti i client montanto windows xp sp2

-edit2-
dimenticavo la configurazione:

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname firewall
domain-name xxxxxxxx.com
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
name 192.168.1.4 MainServer
access-list inside_access_in permit ip any any
access-list outside_access_in permit udp any eq isakmp any eq isakmp
access-list outside_access_in permit ah any any
access-list outside_access_in permit esp any any
access-list outside_access_in permit udp any eq 1701 any eq 1701
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside [ip pubblico] 255.255.255.248
ip address inside 192.168.1.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm location 0.0.0.0 255.255.255.0 inside
pdm location MainServer 255.255.255.255 inside
pdm location 0.0.0.0 255.255.255.255 outside
pdm location 192.168.1.0 255.255.255.255 outside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (outside) 1 82.106.100.40 255.255.255.255 0 0
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
access-group outside_access_in in interface outside
access-group inside_access_in in interface inside
route outside 0.0.0.0 0.0.0.0 83.211.145.129 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd dns 62.94.0.1
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
dhcpd enable inside
terminal width 80

[Wizard]

manca la regola di nat statico:

static (....