Mise en place un vpn windows avec un pix 501

Bonjour,
Je désirerai faire tourner un vpn windows pptp .mon serveur est derriere un pix 501 .j ai fait le test juste derriere mon routeur , ça marche nikel .j ai ouvert le port 1723 en tcp et mis en place le protocole gre .l opération suivante est de mettre mon serveur derriere le pix , c est la ou les soucis commence . je vous envoie ma conf , ce sera plus parlant et dites moi ce qui ne va pas
merci d avance
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password *********** encrypted
passwd /*********** encrypted
hostname polo
domain-name polo.dyndns.org
fixup protocol dns maximum-length 512
fixup protocol esp-ike
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol pptp 1723
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
object-group network dbhosts
access-list NoNAT permit ip 192.168.0.0 255.255.255.0 0.0.0.0 255.255.255.0
access-list 101 permit tcp host 192.168.0.101 any eq ftp-data
access-list 101 permit tcp host 192.168.0.101 any eq ftp
access-list 101 permit tcp host 192.168.0.101 any eq smtp
access-list 101 permit tcp host 192.168.0.101 any eq pop3
access-list 101 permit tcp host 192.168.0.101 any eq domain
access-list 101 permit tcp host 192.168.0.101 any eq https
access-list 101 permit tcp host 192.168.0.101 any eq www
access-list 101 permit udp host 192.168.0.101 any eq domain
access-list 101 permit esp any any
access-list 101 permit tcp host 192.168.0.101 any eq pptp
access-list 101 permit gre any any
access-list 102 permit tcp any host 192.168.0.101 eq ftp-data
access-list 102 permit tcp any host 192.168.0.101 eq ftp
access-list 102 permit tcp host 192.168.0.101 any eq smtp
access-list 102 permit tcp host 192.168.0.101 any eq pop3
access-list 102 permit tcp host 192.168.0.101 any eq domain
access-list 102 permit tcp host 192.168.0.101 any eq https
access-list 102 permit tcp host 192.168.0.101 any eq www
access-list 102 permit udp host 192.168.0.101 any eq domain
access-list 102 permit esp any any
access-list 102 permit tcp host 192.168.0.101 any eq pptp
access-list 102 permit gre any any
pager lines 24
logging on
logging timestamp
logging trap debugging
logging host inside 192.168.0.101
mtu outside 1500
mtu inside 1500
ip address outside 192.168.1.1 255.255.255.0
ip address inside 192.168.0.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool pptp-pool 192.168.0.106-192.168.0.110
pdm location 192.168.0.101 255.255.255.255 inside
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list 101
nat (inside) 1 192.168.0.0 255.255.255.0 0 0
access-group 102 in interface inside
route outside 0.0.0.0 0.0.0.0 192.168.1.253 1
timeout xlate 3:00:00
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
aaa authentication enable console LOCAL
aaa authentication http console LOCAL
aaa authentication serial console LOCAL
aaa authentication ssh console LOCAL
aaa authentication telnet console LOCAL
http server enable
http 192.168.0.0 255.255.255.0 inside
http 192.168.0.101 255.255.255.255 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-pptp
telnet 192.168.0.0 255.255.255.0 inside
telnet timeout 15
ssh 192.168.1.0 255.255.255.0 outside
ssh 192.168.0.0 255.255.255.0 outside
ssh 192.168.0.0 255.255.255.0 inside
ssh 192.168.1.0 255.255.255.0 inside
ssh timeout 60
console timeout 0
vpdn group 1 ppp authentication pap
vpdn group 1 ppp authentication chap
vpdn group 1 ppp authentication mschap
vpdn group 1 client configuration address local pptp-pool
vpdn group 1 client authentication local
vpdn username ******** passsword ********
vpdn enable outside
username ****** password ******** encrypted privilege 15
terminal width 80
: end