Plesk operations show errors: error setting certificate verify locations: CApath: none

Symptoms

• The Extensions Catalog tab shows one of the following error messages:

  PLESK_WARN: error setting certificate verify locations: CAfile: C:\Program Files (x86)\Plesk\admin\conf\cacert.pem CApath: none

  PLESK_WARN: Internal server error

• The same error may occur during Plesk update:

  PLESK_INFO: STDERR: Error in cURL request: error settings certificate verify locations:
  CAfile: C:\Program Files (x86)\Plesk\admin\conf\cacert.pem
  CApath: none

• A WordPress installation via the Applications menu fails with one of the following errors:

  PLESK_ERROR: Error: The following error has occurred during the download of application:
  HTTP Error (0) https://cdn.apscatalog.plesk.com/all-app/WordPress.org/WordPress/5.2.1-273.aps?packager=Plesk

  PLESK_ERROR: Sharing Violation

• Some WordPress packages can be 0 size in %plesk_dir%var\modules\wp-toolkit\packages

• Backup scheduler for domains at Domains > example.com > Backup Manager > Schedule may return the following error:

  PLESK_INFO: Server Error
  500
  PleskException
  
  error setting certificate verify locations: CAfile: C:\Program Files (x86)\Plesk\admin\conf\cacert.pem CApath: none
  
  Type PleskException
  Message error setting certificate verify locations: CAfile: C:\Program Files (x86)\Plesk\admin\conf\cacert.pem CApath: none
  File Catalog.php
  Line 83

• Domains > example.com > Logs > Manage Log Files shows files with sizes bigger than the limit in Log Rotation. For example a file with 4Gb.

• Running Daily Maintenance manually shows why the Daily Maintenance was failing, which is in charge of rotating logs:

  C:\> C:\Users\Administrator>"%plesk_dir%\admin\bin\php.exe" -dauto_prepend_file="" -ddisplay_errors=on "%plesk_dir%\admin\plib\DailyMaintainance\script.php" daily
  error setting certificate verify locations:
  CAfile: C:\Program Files (x86)\Plesk\admin\conf\cacert.pem
  CApath: none
  ERROR: Zend_Http_Client_Exception: Error in cURL request: error setting certificate verify locations:
  CAfile: C:\Program Files (x86)\Plesk\admin\conf\cacert.pem
  CApath: none (Curl.php:455)

Cause

The cacert.pem file located in %plesk_dir%admin\conf is corrupted or missing.

Resolution