Where were you the day the Oculus Rifts died?
An expired software certificate has caused every Oculus Rift in the world to malfunction. As you can guess, that's a pretty major problem, and for the moment, it all seems to stem from something as minor as an expired certificate.
A wave of Rift users have taken to Reddit to complain that the Oculus client will no longer launch, and that error messages like, "Failed to initialise with Oculus: Signature Invalid" and "Can't Reach Oculus Runtime Service" were being returned.
As hard as it may be, the best advice at this time is to simply hang tight and wait for Oculus to resolve the matter with a software update.
The current Nvidia driver version is 391.01, so Oculus Rift users facing these issues have to roll back quite far.
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Oculus Rift headsets across the globe have reportedly stopped working in unison, thanks to an apparent technical oversight on Oculus' part. The dll file contains an expired security certificate, which results in the error.
"We are aware of and actively investigating an issue impacting ability to access Rift software".
Oculus says that affected users can keep abreast of the situation over here.
On Wednesday, Oculus said it was working to fix the problem, although it didn't address the cause of the error. So, all of us who are affected by this problem don't really have anything to do other than wait at this point.
Hopefully the issue gets resolved soon.