See this thread:
Issa to Hillary: Why did State refuse requests to bolster Benghazi security?
From the article:
Furthermore, terrorists had posted pictures of Ambassador Stevens going for a routine morning jog and threatening to abduct or kill him. The Libyan security guards in the Benghazi consulate had been receiving warnings for weeks before the attack to quit, as an attack was planned for the facility. According to Issa, the embassy asked for heightened security for their diplomatic missions and got nothing but static in response.