Okay Roy...

I've read that article from beginning to end, and it does not mention even once that Mr. Obama was warned of an impending attack on the US consulate.

In fact, the article does not mention Mr. Obama's name even once. And the only place it mentions the State Department was where it said they didn't release the details of how Stevens died.

The article you posted seems to have almost nothing to do with warnings that officials received, other that one paragraph.