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

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    T DR

    It seems that if you have (and forgot) a Firewall rule allowing the Plesk Installer to be only accessed from specific IPs the connection will also timed out but it will somehow trigger the Plesk Installer to become locked. The Plesk Installer on CLI then says “Update operation was locked by another update process.” if you try to load the Plesk Installer on CLI e.g. by >plesk installer list. Stop the plesk installer on CLI using the stop command, add you IP, apply the Firewall rule and load the Plesk Installer again now it will load.

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