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I set up Google 2 Factor auth to use 2 Factor Auth with certain sites. But reading over the help suggests that Google 2 Factor Auth is only used to log into Google services like Gmail.

But when I log into Gmail, to does not ask for 2 Factor Auth code.

Is Google 2 Factor Auth used to log into Google services?

Where is the documentation for using Google 2 Factor Auth to log into non-Google services?

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  • Because you haven't enabled it yet. Go here and enable it accounts.google.com/b/0/SmsAuthConfig?hl=en – Adi Jul 29 '13 at 15:31
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    This question appears to be off-topic because it is asking for help to use a web service. – Adi Jul 29 '13 at 15:32
  • I don't understand what you're asking. If you need help setting up Google 2FA, you may ask on Web Applications, but please clarify what you're having trouble with. – Gilles 'SO- stop being evil' Jul 29 '13 at 16:44
  • I'm asking for help in understanding the Google 2FA process. Rod answered the question very clearly. – B Seven Jul 30 '13 at 2:56
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Google calls it 2 step verification. They do not ask for it every time you log in. Only when you log in from a new computer, if you have not used the code in a while, if they think there is something suspicious with your account usage, or, if you clear your cookies from your browser so it appears to be a login from a new PC.

They use this system so that it is not such a big pain in the neck for newbies to 2 factor auth. This is to help convince people to add the 2nd factor.

The theory is that many users are hesitant to use 2-factor because it is an extra step they need to take. If they only need to do it once in a while, but it ensures that someone in China trying to hack the account has that extra hoop to jump through, they are more likely to use it.

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Yes, it works on Google. Most likely what happened, IMHO, is it didn't ask because you were on the same computer that you set it up with.

I see you've asked another question about non-Google services, so I won't answer that here.

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