storyday

force user login into wordpress only from one browser at the same time 
the last login action will kick out the already logged user 
this is a security plugin for wordpress,install this plugin to avoid simultaneously login

multi-login-checker

force user login into wordpress only from one browser at the same time

Eric Zeidan

Generate an extra variable to protect and bypass access to wp-admin or wp-login with a simple extra variable that you may set in the admin page.
Major features in secure_uradmin include:
<ul>
<li>You can enable really easy with a on / off button</li>
<li>You can set the name of your Variable</li>
<li>You can set the name of your hash</li>
<li>Your hash will be saved using wp_hash_password 16 round encryption</li>
</ul>
P.D.: After you enable and set the varname & hash you will need to add them to your wp-admin login url; wp-admin?yourvarname=yourhash

Secure Your Admin

Generate an extra variable to secure your wp-admin access thru a simple variable name & hash passed in the URL

multi-login-checker vs Secure Your Admin