Article ID: 128435, created on Feb 23, 2016, last review on Feb 23, 2016

  • Applies to:
  • Plesk 11.0 for Linux
  • Plesk 10.4 for Linux/Unix


The 500 Internal Server Error upon log in to the Plesk admin panel interface.

The /var/log/sw-cp-server/error_log has the following error:

(mod_fastcgi.c.2476) unexpected end-of-file (perhaps the fastcgi process died): pid: 30885 socket: unix:/usr/local/psa/tmp/sw-engine.sock-0
(mod_fastcgi.c.3259) response not received, request sent: 1136 on socket: unix:/usr/local/psa/tmp/sw-engine.sock-0 for /admin/index.php , closing connection


Corrupted sw-engine package.


  1. Check sw-engine` for consistency with:

    rpm -V sw-engine
  2. If you see the files missing/modified, update sw-engine package:

    Example for CentOS 6 x86_64, Plesk 11.0.90version:

    • Re-install the package as follows:

      rpm -Uvh sw-engine-2.5.1-201206041746.centos6.x86_64.rpm --force

  3. Restart sw-sp-server service:

    /etc/init.d/sw-cp-server restart

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unexpected end-of-file

500 Error

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