I recently re-built my dev box and I use a PPTP connection to connect to various data centres around the place, when I ran into an issue I experienced a while back where the pptp connection would silently die (using pptpconfig on Centos) when I kick of my rsync. Some research lead me to the problem, which was an ‘oversize’ mtu for my little ADSL connection.
Solution:
sudo nano /etc/ppp/ip-up
Add ifconfig ppp0 mtu 1396 before the last line in the file (above exit 0).
