Unable to log in to Plesk or upload files via Plesk File Manager or applications: The file is too big

Symptoms

• Unable to log in to Plesk: Plesk login page is returned in a browser without any errors or warnings

• When uploading a file via Plesk File Manager, one of the following error messages appears:

  The file "picture.jpg" is too big. Try to upload this file via FTP.

  ---

  No upload response

• Cannot upload files in applications, e.g WordPress, Joomla, etc:

  The uploaded file exceeds the upload_max_filesize directive in php.ini

• Extension update fails, e.g Joomla:

  An error has occurred uploading this file to the server.
  The maximum allowed size of PHP to upload files is too low: This is configured from the PHP directives 'upload_max_filesize' and 'post_max_size' (locatable and configurable in your file 'php.ini' or '.htaccess').
  Unable to find the installation package

• In some cases, the following error messages might appear in /usr/local/psa/admin/logs/panel.log:

  PHP Warning: POST Content-Length of 90378782 bytes exceeds the limit of 67108864 bytes in Unknown on line 0
  ERR (3) [panel]: Forgery protection token check failed.
  ERR (3) [panel]: Permission denied.#0

Cause

Low values of directives post_max_size and upload_max_filesize is specified either in Plesk php.ini or in the domain settings.

Resolution

Change the necessary values