.htaccess　記載

あまりにひつこくログインページに不正アクセスするので。

# wp-login.php への海外アクセスをブロック
<Files “wp-login.php”>
Order deny,allow
Deny from all
Allow from 1.0.0.0/8
Allow from 14.0.0.0/8
Allow from 27.0.0.0/8
Allow from 36.0.0.0/8
Allow from 49.0.0.0/8
Allow from 60.0.0.0/8
Allow from 61.0.0.0/8
Allow from 103.0.0.0/8
Allow from 106.0.0.0/8
Allow from 110.0.0.0/8
Allow from 111.0.0.0/8
Allow from 112.0.0.0/8
Allow from 113.0.0.0/8
Allow from 114.0.0.0/8
Allow from 115.0.0.0/8
Allow from 116.0.0.0/8
Allow from 117.0.0.0/8
Allow from 118.0.0.0/8
Allow from 119.0.0.0/8
Allow from 120.0.0.0/8
Allow from 122.0.0.0/8
Allow from 123.0.0.0/8
Allow from 124.0.0.0/8
Allow from 125.0.0.0/8
Allow from 126.0.0.0/8
Allow from 153.0.0.0/8
Allow from 163.0.0.0/8
Allow from 175.0.0.0/8
Allow from 180.0.0.0/8
Allow from 182.0.0.0/8
Allow from 183.0.0.0/8
Allow from 202.0.0.0/8
Allow from 203.0.0.0/8
Allow from 210.0.0.0/8
Allow from 211.0.0.0/8
Allow from 219.0.0.0/8
Allow from 220.0.0.0/8
Allow from 221.0.0.0/8
Allow from 222.0.0.0/8
Allow from 223.0.0.0/8

403エラーで自分も管理画面に入れない場合があるので注意。