Windows PPTP and Cisco VPN Concentrator

[ALMEIDA Antonio Jose]

Hello, 
I'm trying to implement one pptp vpn between one windows xp and one vpn
concentrator. I've no problems with the Cisco vpn client but I get this
error when I try the windows software:

In the software: The PPP link control protocol was terminated.
In the vpn concentrator: User [xxxx] disconnected. Cannot resolve an IP
address for remote peer.

In debug mode, freeradius gives this output:;

auth: type "MS-CHAP"
  Processing the authenticate section of radiusd.conf
modcall: entering group Auth-Type for request 0
  rlm_mschap: Told to do MS-CHAPv2 for toze3 with NT-Password
rlm_mschap: adding MS-CHAPv2 MPPE keys
  modcall[authenticate]: module "mschap" returns ok for request 0
modcall: group Auth-Type returns ok for request 0
Sending Access-Accept of id 38 to AA.BB.CC.DD:1033
        MS-CHAP2-Success =
0x02533d3346343545313438444234344339303636463630454141394444413134444436
4630463137343639
        MS-MPPE-Recv-Key = 0x7bece896d285fa327b97e150aa13cc9d
        MS-MPPE-Send-Key = 0x91606621ce8a086e8a961d21bf250787
        MS-MPPE-Encryption-Policy = 0x00000002
        MS-MPPE-Encryption-Types = 0x00000004
Finished request 0

Can someone help me with this? I've search google for some time now and
I still can't solve this.

Regards,
Antonio