Oculus Rift headsets have stopped working because of an expired certificate

Oculus Rift users say a problem with Oculus Runtime Service's certificate has made all Rift devices useless until Oculus releases an update

We’re aware of an issue impacting people’s ability to use Rift’s software, and we’re working to fix the problem. Please visit https://t.co/uM54CuqqIn for the latest—thanks for your patience!

— Oculus Rift (@OculusRift) March 7, 2018