Plugin not working anymore?

Hi, i have installed the plugin on a fresh 4.2.4 WordPress.

It worked fine yesterday but today the website is shown again…

I tried on different browsers/computers, and I was not logged in. I also tried disabling and enabling the plugin again but with no success.

It is the only plugin activated…

Any idea ? This is driving me crazy…

Here is the website : http://eco-conseil.info

Thanks !

https://ww.wp.xz.cn/plugins/maintenance/