Polygon reports that Oculus Rift virtual reality headsets around the world are experiencing an outage. The outage appears to be a result of an expired security certificate. "That certificate has expired," said the Oculus support team on its forums, "and we're looking at a few different ways to resolve the issue. We'll update you with the latest info as available. We recommend you wait until we provide an official fix. Thanks for your patience." Polygon reports: One place where users experiencing the issue are gathering is on the Oculus forums. Last night user apexmaster booted up his computer, tried to open the Oculus app and was greeted by an error indicating that the software could not reach the "Oculus Runtime Service." That same error is cropping up on computers all around the world, including several devices here at Polygon. Once it has appeared, there's no way to restart the Oculus app, which renders the Rift headset unusable.