Downloads end before max_execution_time

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Nextcloud version 15.0.5.:
Operating system and version Debian 9.9:
Plesk: 17.8.11
PHP version 7.3:

The issue you are facing:

When Downloading large Files the download stops after 460s. This is way before the max_execution_time of php (6000s)

The output of your Nextcloud log in Admin > Logging:
No Error

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '******9nvnj',
  'passwordsalt' => '*********AlCZoxRNRQdJ46jA',
  'secret' => '******ebOFNo0kiXYAn1V4j6Vk76BLH',
  'trusted_domains' => 
  array (
    0 => ''********',
  ),
  'datadirectory' => '*****',
  'dbtype' => 'mysql',
  'version' => '15.0.5.3',
  'overwrite.cli.url' => *******',
  'htaccess.RewriteBase' => '/',
  'dbname' => '*********',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => '******',
  'dbpassword' => '******',
  'installed' => true,
  'maintenance' => false,
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_from_address' => 'cloud',
  'mail_domain' => 'mg-sky.de',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtpauth' => 1,
  'mail_smtphost' => 'localhost',
  'mail_smtpport' => '25',
  'mail_smtpname' => '******',
  'mail_smtppassword' => '*******',
  'updater.release.channel' => 'production',
  'theme' => '',
  'loglevel' => 2,
);

Found a solution, i’ve added some nginx parameters in the config of the server, now it works. proxy_connect_timeout 1200s;
proxy_send_timeout 1200s;
fastcgi_send_timeout 1200s;
fastcgi_read_timeout 1200s;