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pppd: In file /etc/ppp/options.pptpd: unrecognized option 'require-mppe-128'
Yet I had pppd version 2.4.5 which says that option is valid. Turns out there are 3 different possible versions of which my 2.4.5 had a non-standard pppd version.
The following site (expand the comments) led me to this answer "The MPPC flag builds a non-standard PPP that uses different options."
Try something along the lines of the following instead: