Q:

Big Query Service Account access revoked?

I had been accessing Google Big Query with a service account successfully for several days. I had several tests that would connect and perform single functions successfully.
Now, without changing any code, or anything through the API console, I consistently get an "invalid_grant" from all of my API calls.
I have come now-where near breaching the courtesy request limits, and I have billing enabled.
Is there something that I could have done to get my access revoked?
I have tried creating another service account with, with another private key etc, with no success.
I have put my new credentials into the sample code given here: Authenticating Google API with a service account with Java API without success.
Any ideas?
Thanks.

A:

If you had service account authorization working successfully with BigQuery in the past, and it suddenly stopped working (and it's consistently not working), I would guess that the issue has something to do with the clock on your server. 
I would check this first - if the clock seems to be off, use something like NTPdate (http://doc.ntp.org/3-5.93e/ntpdate.html) to make sure that it is synced with an NTP server.

