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I got mail from Gmail saying someone from a certain IP tried to log-in and it was prevented and that I should reset my password by following the given link if I don't recognise the address.

...We prevented the sign-in attempt in case this was a hijacker trying to access your account...

However, this is not from a hijacker but from an application I set up some time ago. Now it can not access my account. How can I remove the prevention of the sign-in?

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Why can't you access your account? What's the problem? –  Bibhas Jun 21 '12 at 5:04
If it’s an app, how about enabling the application-specific password feature? –  Alex Dec 29 '13 at 11:12

2 Answers 2

up vote 4 down vote accepted

You should be able to use Google's Unlock Catpcha to unblock your application. I can't find much official doco on it, but according to this post if you unlock with the captcha logins for the next ten minutes are recognised as legitimate.

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In fact, I do NOT have full authorization of the application, which, in my case, is sipsorcery. I just checked my sipsorcery account, and it turns out that my google account was set up as sip provider in sipsorcery. However, sipsorcery failed to register into google account, and I guess that google has prevented it to sign in. Any one has a solution for it? –  Alert Jun 22 '12 at 4:49
It appears Unlock Catpcha does work in my case. support.google.com/mail/bin/answer.py?hl=en&answer=78754 –  Alert Jun 22 '12 at 5:21

Go into the the message and then, on the bottom right hand corner there should be a button that says details. Click that then choose 'Never show an alert for unusual activity' Then after 7 days it should stop sending you them alerts, in 7 days because they want to make sure that the 'bad guys' did not choose that. Then from then on you shouldn't be getting any more annoying alerts.

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