I know others are having issues with PPTP so I thought I would post mine 
in an effort to help find out what the problem is.

I have 50 PPTP servers deployed. These are a mix of Monowalls on both 
PCs and Soekris boards and WRT54Gs running DD-WRT. I can always connect 
to the DD-WRTs without issue. A few are in other countries and they work 
fine. I can always connect to the Monowalls that are running 1.2b6 or 
prior. All of the Monowalls that run 1.2 or 1.21 give error 619 when 
trying to connect. A reboot only fixes them for a short period.

I know that 619s are usually problems with GRE, but like I said, I can 
connect to 30 other routers immediately after being given a 619 from a 
1.2 Monowall.

Does anybody have any idea about this? I have thought about just 
downgrading the 1.2s to less than 1.2b6 but I want to hold off if I can.

Any suggestions?