Article ID: 126226, created on Jul 17, 2015, last review on Aug 29, 2015

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux


Plesk login page shows the 500 Internal Server Error

The following errors can be found in /var/log/sw-cp-server/error.log:

2014-04-03 11:20:43: (mod_fastcgi.c.1068) the fastcgi-backend /usr/bin/sw-engine-cgi -c /usr/local/psa/admin/conf/php.ini -d auto_prepend_file=auth.php3 -u psaadm failed to start:
2014-04-03 11:20:43: (mod_fastcgi.c.1072) child exited with status 1 /usr/bin/sw-engine-cgi -c /usr/local/psa/admin/conf/php.ini -d auto_prepend_file=auth.php3 -u psaadm
2014-04-03 11:20:43: (mod_fastcgi.c.1075) If you're trying to run your app as a FastCGI backend, make sure you're using the FastCGI-enabled version.
If this is PHP on Gentoo, add 'fastcgi' to the USE flags.
2014-04-03 11:20:43: (mod_fastcgi.c.1171) [ERROR]: spawning fcgi failed.
2014-04-03 11:20:43: (mod_fastcgi.c.3644) all handlers for /index.php? on .php are down.


The wrong permissions and owner were set for the /tmp directory and suexec binaries.


In order to fix the issue set valid permissions for /tmp, /usr/sbin/suexec and /usr/lib64/sw-cp-server/sw-suexec:

# chown root:root /tmp
# chmod 1777 /tmp

# chown root:apache /usr/sbin/suexec
# chmod 4510 /usr/sbin/suexec

# chown root:sw-cp-server /usr/lib64/sw-cp-server/sw-suexec
# chmod 4710 /usr/lib64/sw-cp-server/sw-suexec

And restart sw-cp-server then:

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

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