The website will stay hosted on the server, but visitors will be redirected with the 503 HTTP code to the custom error document page. Here you can edit the custom error document.
Please follow the following steps:
1) Login to Plesk control panel.

2) Click on Websites & Domains.

3) Click on Disable.

Information: The website status for gwdemo.com was successfully changed.
Activate suspended Subscription.
4) Clickon Activate.

Information: The website status for gwdemo.com was successfully changed.
