A password of the Plesk "admin" user is lost.
How to retrieve/reset it?
To get/reset a password of the Plesk "admin" user, an SSH access to the Plesk server is required.
Once connected, use the instructions for your Plesk version.
Retrieving a password
Due to security reasons, the command to retrieve the 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 hostname, another - by server IP address:
# plesk login
Note: If a server hostname is not resolvable from the Internet, the link for it 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