I have noticed a user asking the exact same question both on serverfault and stackoverflow. I'm referring to this question:
To me it is obvious that the user placed to question on both sites to gain more attention. It has already been pointed out in other questions on meta serverfault crossposting is considered bad behavior, but I can't flag this question as duplicate because the flag as duplicate function gives me
The duplicate question must exist on Server Fault
I would like to see a clear guideline how to deal with those question and maybe it should be made possible to mark questions as duplicate when asked on other stack exchange sites.