Unable to log in using Google Apps due to error "Unexpected error in the authentication system."

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A user tries to log in using Google and after he/she clicks the 'Log in using Google' button the following error appears:

Unexpected error in the authentication system.



  1. One of the possible causes may be because there is a user already created on the application which username is the full email address, instead of just the part before the @ sign.
  2. Another cause is when the username and its email address (the part before the @ sign) doesn't match, i.e. 

In the example above, when the user logs in with Goggle using the email testing@example.com, JIRA will check if there's already a username 'testing'. If the username 'testing' doesn't exist, JIRA will automatically try to create it, however, this operation will fail because because there is another username which email is 'testing@example.com'.



Edit this user's details and change its username removing the '@example.com' part.

Last modified on Feb 26, 2016

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