- Plesk for Linux
- Plesk for Windows
Unable to open the Updates and Upgrades page or start Plesk Installer in a command-line interface, when another Plesk Installer process is running on a server:
# ps aux | grep install | grep -v grep
root 11451 1.7 0.7 193396 14764 ? S 15:35 0:00 /usr/local/psa/admin/bin/autoinstaller --service-mode --enable-xml-output --ssl-cert /usr/local/psa/admin/conf/httpsd.pem --branch release,stable --web-interface --with-ssl --disable-browser
root 11452 0.0 0.1 104832 3484 ? S 15:35 0:00 /usr/local/psa/admin/bin/autoinstaller --service-mode --enable-xml-output --ssl-cert /usr/local/psa/admin/conf/httpsd.pem --branch release,stable --web-interface --with-ssl --disable-browser
On Windows Server:
In a command prompt:
C:\> wmic process where "caption like '%installer%'" get processId,caption
In Task Manager:
When clicking on the Updates and Upgrades page in Plesk, Plesk Web Installer prompts for a root password or does not open at all with one of the following error messages in a web-browser:
PLESK_INFO: The connection has timed out
PLESK_INFO: Can't connect to backend: No such file or directory
PLESK_INFO: This webpage is not available.
When starting Plesk Installer in a command-line interface, the following message is shown:
MYSQL_LIN: BUSY: Update operation was locked by another update process.
Only one instance of Plesk Installer can be launched at a time.
Previously started Plesk Web Installer process (Tools & Settings > Updates and Upgrades) is still running on the server.
By design, if Plesk Web Installer was opened in a web-browser and then closed, its process will still be active and will be terminated automatically after 30 minutes of inactivity.
Previously started Plesk Installer process hanged for some reason and could not be terminated automatically.
Another Plesk administrator is using Plesk Installer.
Terminate active Plesk Installer processes to start Plesk Installer.
Note: Before applying the solution below, make sure that other users on the Plesk server are not using Plesk Installer.