VPN

Hi
I have a Monowall v1.22
My network is:

INTERNET -> Router Cisco(172.16.Y.XX)  -> WAN Monowall (172.16.Y.X)
OPT1 Monowall (172.16.S.X) -> PROXY (172.16.S.XX)
LAN Monowall (192.168.Y.X) -> NETWORK (192.168.Y.0)

Config PPTP
Server 192.168.y.41
Range 192.168.y.160/28

RULE PPTP
access  Protocol * Source -> PPTP Client ---- Destination -> *

I have a problem, I can  up the VPN from inside LAN but I can't create VPN from WAN (Error 800)
I prove all possible combinations but nothing.

I have to change any parameter of Cisco ?   

Thanks for all and sorry, my english is not good.

If your WAN is 172.16. it's private IP space and your ISP must be NAT'ing you somewhere. You need a public IP on your WAN to use PPTP.

From what you have put, the Cisco router has your public IP address and the wan side of the Monowall sits in a seperate segment with the LAN side of the Cisco.  You could try to config the Cisco to either pass the external Ip to the Monowall (Bridge or Half bridge mode) or set the Wan IP of the Mono box as the DMZ for the Cisco, so all incoming traffic is forwarded to the monowall.