Symptoms
When opening Plesk Onyx 17.5.3 or Plesk Onyx 17.8.11, the following error message is shown in a web-browser:
The file /opt/psa/admin/htdocs/application.php is part of Plesk distribution. It cannot be run outside of Plesk environment.
Cause
The issue is with Domain Traffic Monitor extension on Plesk Onyx 17.5.3 / Plesk Onyx 17.8.11 with old update.
Resolution
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Connect to the Plesk server via SSH.
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Temporarily disable the Domain Traffic Monitor extension:
# plesk bin extension --disable traffic-monitor
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Apply one of the following steps:
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for Plesk Onyx 17.5.3:
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for Plesk Onyx 17.8.11:
Upgrade to Plesk Obsidian or update Plesk Onyx 17.8.11 to the latest micro-update with the command:
# plesk installer update
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Enable the extension back.