Down around 13:17 UTC - Back online at 14:20 UTC
Service have been available intermittently and throwing 500 errors.
Status page: https://status.cloud.google.com/
Other press links: http://mashable.com/2016/04/19/google-oauth-down/
None of their Google Cloud services are working for me, but the page says everything is operating normally.
This is not the first time this has happened either. Their status page has been truly useless. There is often degraded service or services going out for an hour or two with nary a blip on their status tracker.
This is not what I'd call "Normal", Google. You can do better with monitoring services, and you know it.
https://status.cloud.google.com/incident/appengine/16003
"The issue with Authentication Services should have been resolved for all affected projects as of 07:24 US/Pacific. We will conduct an internal investigation of this issue and make appropriate improvements to our systems to prevent or minimize future recurrence. We will provide a more detailed analysis of this incident once we have completed our internal investigation."
I wonder why they don't have an API status page or, if they do, why it is so difficult to find.
"We are investigating an issue with Authentication services. We will provide more information by 07:30 US/Pacific."
If I'm right about the timezones (50/50 chance) '07:30 US/Pacific' was about 3 hours ago.