I answered a question on ServerFault yesterday. It appeared off topic there (probably that's true), but it was just asked again on SuperUser, where it is probably on-topic. Should I copy that answer here?
As it is on topic here then it makes sense to post your solution here.
I would be tempted, for cleanliness sake, to delete your answer on Sever Fault so that the question can be cleaned up by OP or the Roomba but that is your choice. At the moment your answer is blocking their question from being deleted by the original asker and the Roomba because it has upvotes. You do not have to delete it though, as it is not really your fault it is off topic and your rep is your rep, but the question does not really belong there.
Past that if your question is an answer and solution then feel free to bring it over.