After installing ur plugin, I was unable to login to my sites Admin. And my CPanel also not allowing me to login to my account. And a link to the authors site returning an error 401 when i verified with tools.pingdom.com/fpt.
This miss-function is due to "WordPress HTTPS (SSL)" plugin installation in my site. Now I removed all these and re-installed "WP Maintenance" plugin, now its working except timer on the interface.