unoapp protect wp admin allows access for you only by URL change and access on IP based.

Kartik Busa

Many time sites hacked by admin access because it’s common URL for all wp-admin, this unoapp protect wp admin gives advanced security against hackers.
Are you seeing a lot of attacks on your WordPress admin area? Protecting the admin area from unauthorized access allows you to block many common security threats 
unoapp protect wp admin helps solve this problem by allowing webmasters to customize their admin panel URL and access allows only selected ips.
After installed and configured unoapp protect wp admin plugin, administrator able to change the “sitename.com/wp-admin” link into “sitename.com/custom-admin”.
The plugin also restrict admin access by multiple ips based
** NOTE: You should keed backup your database before activating this plugin.** 
for some reason, you find it necessary to restore your database from these backups.
<h4>Features</h4>
<ul>
<li>Option to change custom wp-admin into both sides after logged in and before login URL(i.e http://yourdomain.com/custom-admin)</li>
<li>Automatically change “Register” page URL</li>
<li>Automatically change “Lost Password” page URL</li>
<li>Restrict applied for registered non-admin users from wp-admin</li>
<li>Allow admin access by defining comma separated multiple ips</li>
</ul>
<h3>Important</h3>
1) Save the slug.
2) Please put below two lines code in your wp-config.php file above of Absolute path (ABSPATH).
define(‘WP_ADMIN_DIR’, ‘office-admin’);
define(‘ADMIN_COOKIE_PATH’, SITECOOKIEPATH . WP_ADMIN_DIR);
3) 
Sometimes it’s issuing while permalink settings not updated. 
Some time .htaccess not updated due to permission issue, permalink issue or some other security plugins, in that case, you can update .htaccess manually.
<pre><code># BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteRule ^custom-admin/(.*) wp-admin/$1?%{QUERY_STRING} [L]
RewriteRule ^custom-admin/?$ wp-login.php [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
</code></pre>

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