Help with pptpd and SuSEfirewall2

I am still working on getting pptpd working on the same system with SuSEfirewall2. I can get pptpd working by itself, and on a second system that the SuSEfirewall2 firewall is forwarding to but no matter what I do I can't get pptpd working on the same system as SuSEfirewall2 is running on. MY first question is: has anyone got this working or did you resort to your own firewall rules? If you did what is the secret? I have both tcp:1723 and GRE set in the firewall. Thanks, Robert