A password of the Plesk "admin" user is lost.
How to get/reset it?
Connect to a Plesk server via SSH and use the instructions applicable to your Plesk version.
Note: The commands presented below do not change the password for MySQL "admin" user. To restore the password for MySQL "admin" user, visit this KB article.
Getting a password
For security reasons, the command to retrieve a Plesk "admin" password has been removed in Plesk Onyx.
Use a one-time login link to log in to Plesk without a password. To generate a one-time login link:
Run the following command to generate two links: One - to access Plesk by its hostname, another - by server IP address:
# plesk login
Note: If a server hostname is not resolvable from the Internet, hostname link will not be generated.
Copy one of the generated links and open it in a web-browser.
Plesk 12.x / Plesk 11.x / Plesk 10.x