Failed to login with username "admin" because no user with that username exists

Try to click on the time (“13 heures ago”) and see if that popup window gives you any more info.

here is the result when i click on the time :

Context data
This is potentially useful meta data that a logger has saved.

Key Value
id 341
logger SimpleUserLogger
level warning
date 2015-01-26 08:56:55
message Failed to login with username “{failed_login_username}” because no user with that username exists
type
initiator web_user
occasionsID fc19fe068b4a1e111ed26b846cc30560
subsequentOccasions 1
rep 1
repeated 10
occasionsIDType fc19fe068b4a1e111ed26b846cc30560
context_message_key user_unknown_login_failed
failed_login_username admin
server_http_user_agent Mozilla/5.0 (Windows NT 6.1; rv:19.0) Gecko/20100101 Firefox/19.0
_message_key user_unknown_login_failed
_server_remote_addr XX.XX.XX.XX (My server IP)
_server_http_x_forwarded_for_0 213.231.30.36
_server_http_referer domaine.com/wp-login.php

Your server is probably behind a proxy or something similar, and thats why you see you server IP as the remote address. If you instead check the “_server_http_x_forwarded_for” value that is 213.231.30.36 and that goes to an IP somewhere in Ukraine:
https://ipinfo.io/213.231.30.36

My guess is that someone there simply is trying to login to your WordPress admin. Either a person or a computer part of a bot network or similar.

Hmm ok fortunately I changed administration login but it s weird that he can achieve some attempt even if I m using a ReCaptcha and login URL is changed from default wp-admin