This question already has an answer here:
How do I migrate my question from Stack Overflow to Server Fault?
I searched how to migrate in Meta Stack Overflow, but I didn't absorb how to do it.
Update: Looks like the question in question is a bit too localized. Please don't flag for migration.
Flag the question for moderator attention with the "other" option and ask for migration to Server Fault.
Make sure you know that it is on topic for them. Server Fault expects questions to be at the professional level, so not all such questions are on topic there.