PPTP over Zyxel NAT and win2003 server

Hi, I have a win2003 server behind a Zywal with full NAT. In the win2003 server I have 2 NIC's, each one with a privat IP and both public IP over NAT. The DHCP server is on another machine, win2000 server, in the same LAN. I setup a PPTP VPN (TCP/IP1723 fw and GRE on Zyxel). No VPN Zyxel firewal, only NAT.

Parameters: auth=MS CHAPv2, encr=MPPE 128, compression MPPC

From LAN, the VPN is connected and autheticated >From outside (from WAN) I'm not authenticated! with netstat the port
1723 on server is open (this mean the firewall settings are ok... I suppose) Any ideea about this?

Thanks a lot.

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silviudg
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