Unable to download or access huge backup file in Plesk interface: 504 Gateway Time-out

Symptoms

• Unable to download or access huge backup file (more than 20 GB or with multiple incremental backups) in Tools & Settings > Backup Manager > necessary_backup > Download:

  CONFIG_TEXT: 504 Gateway Time-out

  PLESK_ERROR: This operation is taking too long. Check the results in a few minutes.

• The following error can be found in /var/log/plesk/sw-cp-server/error_log:

  CONFIG_TEXT: [error] 2146#0: *42 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 203.0.113.2, server: , request: "POST /admin/backup/download-dump?_randomId=987887 HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock", host: "example.com:8443", referrer: "https://example.com:8443/admin/backup/local-repository?_randomId=541875"

• The following timeout limits are set on the server:

  # grep "timeout" /etc/sw-cp-server/config | grep "fastcgi"
  fastcgi_read_timeout 600;
  fastcgi_send_timeout 600;
  # grep "max_execution_time" /usr/local/psa/admin/conf/php.ini
  max_execution_time = 600

Cause

Insufficient timeout limits set for Plesk.

Resolution

1. Connect to the server via SSH

2. Open /etc/sw-cp-server/config file using a text editor

3. Adjust timeout limits for FastCGI, for example:

   CONFIG_TEXT: fastcgi_read_timeout 1200
   fastcgi_send_timeout 1200

4. Open /usr/local/psa/admin/conf/php.ini file using a text editor.

5. Adjust timeout limits for PHP, for example:

   CONFIG_TEXT: max_execution_time = 1200

6. Restart sw-engine and sw-cp-server services:

   # service sw-engine restart
   # service sw-cp-server restart

If the issue still persists increase timeout limits even greater.

Also, it is possible to download the backup directly from the server bypassing Plesk interface.