PPTP with Centos Server & Win 7 client not providinf default gateway

PPTP with Centos Server & Win 7 client not providinf default gateway

I am trying to setup a Centos 5.8 box as a PPTP server - it worked in the
past and no logner does.
My issue is that the client (win7) receives 0.0.0.0 as default gateway and
hence cant route anything. Cant ping the Centos box on the vpn @, cant
access the web. When I uncheck the use default gateway box from win7, I
can reach the Centos box.
I've disabled (temporarily) all iptables rules but the -A POSTROUTING -o
eth0 -j MASQUERADE - I have /proc/sys/net/ipv4/ip_forward set to 1
Any suggestion as how can the server provide a correct gateway address to
the client ?
Tks in advance