In Are some off-topic questions necessary for a healthy community? there's a general discussion of how we should be handling questions that are pretty clearly not RPi-specific. I think the general idea there, that we should lead people (especially beginners) to a short summary of how the question relates to the Pi vs. other systems and where they should go for further help, is great. However, this post is old and I'm not sure to what degree it's been implemented.
In order to understand better how the community wants to handle these things, please explain to me how we should handle the specific question Error connecting to my Raspberry Pi OpenVPN server and the reasoning behind that.
NOTE: I'm actually looking for what you think the ideal action would be with this particular question mentioned above. Should I, for example, go through all the various OpenVPN questions recently asked here, create a "generic" question with an answer that covers the high points of what they asked, and then flag the question here as a duplicate of that? Should we just leave the question as it is and take no further action? Something between the two?