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Confluence records the number of failed logins attempts made against each user account. When the login attempts exceed a preset number, the user will prompted to authenticate using CAPTCHA until they successfully log in.
If you are a Confluence Administrator, you can manually set the failed login count for a user back to zero.
To reset the failed login count for a user:
Related pages:
The information on this page does not apply if you have multiple Cloud apps. If you are only using Confluence Cloud, the information does apply.
Screenshot: Resetting the failed login count for a user