I found my self forget about the url of my site‘s backend, then i do some searching about a solution about it. Okay let’s try to debug it.
First you should login to your site’s cpanel/spanel/plesk etc.
Second go to your file manager, search for a .htaccess.
Third open the .htaccess with editor and search for “Hide Backend”, you might find “RewriteRule ^(/)?url_new_login/?$ /wp-login.php [QSA,L]” and copy the string “url_new_login”.
Fourth in browser window type http://yourdomain.com/url_new_login , change “url_new_login” with the one you copy.
Hopefully this way will help you locate your lost backend ITheme security cause it surely helps me.