Title: Sucuri – User authentication failed: Unknown user
Last modified: August 30, 2016

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# Sucuri – User authentication failed: Unknown user

 *  [devra](https://wordpress.org/support/users/devra/)
 * (@devra)
 * [10 years, 7 months ago](https://wordpress.org/support/topic/sucuri-user-authentication-failed-unknown/)
 * We have recently installed several plugins to combat brute force login attacks.
   These plugins are:
 * Login Lockdown – suspend IP after repeated failed login attempts
 * HumanCaptcha – Captcha with human readable questions/answers
 * Protect Your Admin (Protect WP Admin) – change url of /login/, /login.php, and/
   wp-admin/.
 * Sucuri – monitor login attempts
 * The flood of login attempts with user of admin has stopped. But Sucuri shows 
   me repeated failed login attempts with user listed as unknown. The IP of these
   attacks is always somewhere in Eastern Europe.
 * Can anyone explain to me how a person or a robot can attempt to login without
   a userid? Or, how can they circumvent not knowing the url to login?
 * BTW, we do not have a userid of admin, nor do we have a userid of 1. Also, these
   login attempts are happening in the early morning hours, before Americans are
   awake.
 * Thanks,

The topic ‘Sucuri – User authentication failed: Unknown user’ is closed to new replies.

## Tags

 * [login failed](https://wordpress.org/support/topic-tag/login-failed/)

 * 0 replies
 * 1 participant
 * Last reply from: [devra](https://wordpress.org/support/users/devra/)
 * Last activity: [10 years, 7 months ago](https://wordpress.org/support/topic/sucuri-user-authentication-failed-unknown/)
 * Status: not resolved

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