I recently enabled 2-factor authentication in Gmail. I have two computers running, and I setup Google Talk and Outlook on both to use the app password. I also enabled my phone to use the app password.  I have a rogue application out there that is requesting access every 28 minutes, which means I get a text message every 28 minutes. Is there any way I can tell which application is requesting authentication?
How can I tell what app is requesting access to my Gmail?
gmail