To suspend a domain (Web site):
1) Login to Plesk control panel.
2) Go to Domains > domain name.
3) Click Suspend.
The domain (Web site) will be suspended, its Web, FTP and mail services will no longer be accessible to the Internet users, and domain owner will not be able to log in to the control panel.
To unsuspend the website :-
1) Go to Domains > domain name.
2) Click Unsuspend.