And… If you’re using the latest Smoothwall, you’ll also need ipfwd support:
http://www.cag.lcs.mit.edu/~cananian/Projects/IPfwd/

Say you have a Smoothwall software firewall and a PPTP VPN server running behind it.
You’ll find that, after forwarding all traffic on port 1723 to your server, you won’t be able to connect to it through the internet.
If you edit
/etc/rc.d/rc.networks
and add (at the bottom, right under the “fi”):
ipfwd –masq IP_Address_of_your_PPTP_Server 47 &
For example: ipfwd –masq 192.168.1.1 47 &
you’ll see it works!
Happy VPN-ning!
Source: Wie kann ich PPTP zu einem internen MS VPN Server forwarden? | Smoothwall.org Home Page

Wat kun je doen als Excel2002 (ExcelXP) niet (meer) doet wat jij wilt?
Klik hier voor Microsoft KB280504 over het troubleshooten van Excel.
Click here for English.