Unfortunately you're not giving very much information, can you be more specific about what you're trying to achieve and where exactly it goes wrong. Can some people succesfully connect and you can't or is it something else?
Please consider changing from PPTP to another VPN solution (SSL or L2TP), it's much safer than PPTP.
Managing several Sophos UTMs and Sophos XGs both at work and at some home locations, dedicated to continuously improve IT-security and feeling well helping others with their IT-security challenges.
