One reason I propose is either 

> **Failure to show prior effort to solve the problem**

>According to our [guidelines for asking a good question](http://serverfault.com/help/how-to-ask), Server Fault should be the last stop in your quest for an answer, after you've exhausted other avenues of research.

A more well encompassed reason would be something like

> **This question does not meet the minimum requirements set by the community.**


>This question either shows a lack of prior research, lack of information, or otherwise does not meet the guidelines of [how to ask a good question](http://serverfault.com/help/how-to-ask)

This is only one suggestion, just two options for verbage.