Login with google dont work

I just tried with Google+ authentication. The only permissions I had to grant were:
* Know who you are on Google
* View your email address
Those are standard permissions that need to be granted by any user trying to authenticate with Google+.

Once I accept, I'm brought back to your page and not logged in, but the following message is shown:

Wir konnten Deine Google Account Informationen nicht abrufen. Bitte versuche es erneut.

That usually means there's a communication problem when talking to Google from your server. What I'd recommend to test is:
1) In the JFBConnect -> Configuration area, set "Enable Debug Mode" to Yes. A better error message may display as to why authentication won't occur.
2) Disable SEF URLs on your site, either from the Joomla Global Configuration area or any 3rd party SEF extensions you have enabled.
3) Test with Facebook authentication. Ensure that works as expected.
4) If you have any Social Profile plugins enabled, disable them and test again.

Let me know if any of the above steps provide any more information or fix the problem. Then, we can go from there.

Thanks,
Alex