Knowledge Base

Unable to open the “Updates and Upgrades” page or start Plesk Installer in CLI: Update operation was locked by another update process

When clicking on Updates and Upgrades in Plesk, the page prompts for a root password or does not open at all with one of the following error messages in a web-browser:

The connection has timed out

This site can’t be reached

ERR_TIMED_OUT
When starting Plesk Installer in a command-line interface, the following message is shown:

BUSY: Update operation was locked by another update process.

Error: Unable to start Plesk Installer. The following error has occurred: Installation could not be started: another installation procedure is currently running.

A Plesk Installer process is running on the server already, but only one Plesk Installer process can be launched at a time.

Terminate active Plesk Installer processes:

Note: Before applying the solution below, make sure that other users on the Plesk server are not using Plesk Installer.

Connect to the Plesk server via SSH (Linux) / RDP (Windows Server)
Stop Plesk Installer processes (on Windows Server, use a command prompt as Administrator):

# plesk installer stop