Hi mm,

You get a CaptchaRequired error when you hit the ClientLogin endpoint very 
frequently to generate an authToken. See 
http://code.google.com/apis/accounts/docs/AuthForInstalledApps.html for 
details. I'd troubleshoot this issue as follows:

- Check if your application is sending the correct credentials to the 
server. A http proxy like Fiddler is a good tool to do this; it can decrypt 
https traffic too if required.
- Try unlocking the account and see if that addresses the issue: 
https://www.google.com/accounts/UnlockCaptcha
- See if your application is trying to retrieve fresh credentials for the 
right reasons (i.e. in response to an GOOGLE_ACCOUNT_COOKIE_INVALID error). 
See 
http://adwordsapi.blogspot.com/2010/07/discover-v2009-working-with-authtokens.html
 
for details.
- Reduce the frequency at which you hit ClientLogin endpoint. An authtoken 
is typically valid for 2 weeks, and the server throws an 
GOOGLE_ACCOUNT_COOKIE_INVALID when you need to get a fresh authtoken.

Hope this helps. Let me know if you need more help.

Cheers,
Anash P. Oommen,
AdWords API Advisor.


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