How to restrict access to files and directories located within a Virtual Directory in Plesk
To restrict access to files and directories located within a virtual directory, perform the following steps:
1 – Logged in to Plesk.
2 – Go to Websites & Domains, and find the website’s domain name.
3 – Click Virtual Directories.
4 – Navigate to the directory you want to protect and click the Protection tab.
5 – To specify users who will be able to access the directory, click Add User, specify username and password, and click OK.
6 – If you want to specify a title for the protected area that will be shown to users when they attempt to access the directory, click Settings, specify a title, and click OK.