Different operations in Plesk fails with error: System error 13: Permission denied

Symptoms

• An operation in Plesk interface fails with a Permission denied error:

  Unable to read components configuration from the service node: sh: /usr/local/psa/admin/bin/packagemng: Permission denied

  ---

  ifmng: execve failed for /usr/local/psa/admin/sbin/ifmng: Permission denied
  System error 13: Permission denied

  ---

  ERROR: Service_Agent_Exception
  Unable to execute php_handlers_control: php_handlers_control: execve failed for /usr/local/psa/admin/sbin/php_handlers_control: Permission denied
  System error 13: Permission denied

  ---

  ERROR: PleskUtilException
  mailmng-server failed: mailmng-server: execve failed for /usr/local/psa/admin/sbin/mailmng-server: Permission denied
  System error 13: Permission denied

  ---

  external error: mailmng-mailname failed: Unable to open dir /var/qmail/mailnames/example.com/test/@attachments: Permission denied System error 13: Permission denied

  ---

  lsws_cmd: execve failed for /usr/local/psa/admin/sbin/modules//litespeed/lsws_cmd: Permission denied

  ---

  ERROR: PleskFatalException: StatInfo->getProductVersion failed: sysinfo failed: sysinfo: execve failed for /usr/local/psa/admin/sbin/sysinfo: Permission denied

• Migration pre-check fails with the following error:

  COMMAND: '/usr/local/psa/admin/sbin/modules/panel-migrator/plesk-migrator' 'generate-migration-list' '/usr/local/psa/var/modules/panel-migrator/sessions/20171101170413/config.ini' '--migration-list-format=json' '--migration-list-file=/usr/local/psa/var/modules/panel-migrator/sessions/20171101170413/migration-list-raw.json' '--skip-services-checks' '--include-existing-subscriptions' '--async' '--overwrite' '--reload-source-data' EXIT CODE: 126 STDOUT: STDERR: sh: /usr/local/psa/admin/bin/modules/panel-migrator/plesk-migrator: Permission denied

• Plesk license may not be installed/updated with:

  The license key is invalid. In order to use Plesk, please obtain and install a new valid license key. The license key is intended only for use with Plesk operating inside the following virtual environments: Virtuozzo containers, VMWare, Microsoft Hyper-V, Xen, KVM, Virtuozzo Server, LXC, Docker.

Cause

Plesk service cannot execute a backend utility or the utility is unable to change some files due to incorrect permissions.

Resolution

1. Connect to the server via SSH.

2. Fix the incorrect permissions/ownership using plesk repair fs:

   # plesk repair fs -system