Cobra Forum

Question: A website/webmail hosted in Plesk on CentOS/RHEL is showing internal server error 500: Exec format error: exec of /usr/sbin/suexec failed


Applicable to:

• Plesk for Linux

Symptoms

• A website or webmail is not loading with the error:

500 Internal Server Error

• The following error messages appear in domain's logfile or in Apache error logfile /var/log/httpd/error_log:

(8)Exec format error: exec of '/usr/sbin/suexec' failed
Premature end of script headers: cgi_wrapper
(104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
Premature end of script headers: wp-login.php

• The following error message is shown on the Home page or reported by Apache configuration checker reports:

# httpd -t
AH00526: Syntax error on line 15 of /etc/httpd/conf/plesk.conf.d/webmails/144000m.com_webmail.conf:
SuexecUserGroup configured, but suEXEC is disabled: Missing suexec binary /usr/sbin/suexec


Cause

File /usr/sbin/suexec is corrupted or missing.


Resolution

1.Connect to the Plesk server via SSH.

2.Rename the corrupted file (if exists):

# mv /usr/sbin/suexec /usr/sbin/suexec.orig

3.Restore the /usr/sbin/suexec file:

# cp /usr/lib64/plesk-9.0/suexec/psa-suexec /usr/sbin/suexec

# chown root:apache /usr/sbin/suexec

# chmod 4510 /usr/sbin/suexec