Connecting my SLED10 (Suse Linu Enterprise Desktop) to my office’s Windows VPN was something of a struggle, I had to try several different methods just because PPTP didn’t come installed by default on my Gnome NetworkManager.
To make it work you need to install the following:
On Suse Linux (Using Gnome)
1 – Use the Software Management, search for VPNC, PPTP, SMPPD, NetworkManager and install them all
2 – Then download the NetworkManager-pptp from software.opensuse.org – you can select the desired version of the OS.
3 – Restart the NetworkManager and then create your PPTP VPN Tunel
1 – Use YAST, search for VPNC, PPTP, SMPPD, KVPNC and install them all
2 – Run KVPNC and create a profile in order to connect
On Debian based distros (Debian, Ubuntu, Kurumin)
1 – sudo apt-get install network-manager-gnome network-manager-pptp
2 – launch or restart the Network Manager
1 – apt-get install KVPNC
2 – launch KVPNC and create a profile in order to connect
If you have problems connecting, check your firewall, I had problems specially with Firestarter on my Kurumin Linux (Debian based Brazilian distro)