Issue 500 Internal Server Error for one of my websites

[nicksti]

Hy, i search for a soulution since days.

My server runs with Ubuntu 18.04.4 and apache.

one of my sites which are written with CakePhp throws a 500 Internal Server error with less log entries.
When I call the index.php on command line with php index.php, I get the regular HTML-Code.

log entries from /var/log/apache2.error.log

Premature end of script headers: index.php
Error parsing script headers
AH01075: Error dispatching request to :

log entries from /var/www/vhosts/my-site.com/logs/access_ssl_log
[20/Sep/2020:08:37:36 +0200] "GET / HTTP/1.1" 500 3542 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36"

When I use FastCgi de Plesk-Predefined ErrorDoc is shown.
WhenI use FPM just a blank side is shown.

I have no idea

 

[Dave W]

what shows in /var/www/vhosts/my-site.com/logs/error_log ?

 

[nicksti]

this is all what i can find.

Premature end of script headers: index.php
[Tue Sep 22 08:12:10.814109 2020] [proxy_fcgi:error] [pid 29358:tid 139985030199040] [client 11.11.111.140:61963] AH01070: Error parsing script headers
[Tue Sep 22 08:12:10.814114 2020] [proxy_fcgi:error] [pid 29358:tid 139985030199040] (22)Invalid argument: [client 50.21.190.140:61963] AH01075: Error dispatching request to :

 

[IgorG]

AH01075: Error dispatching request to :

Check that SELinux is in enforcing mode:

# getenforce
Enforcing

When SELinux is set to permissive mode, the issue no longer persists.

 

[nicksti]

Sorry, SElinux is not supported in PLESK with Debian-Systems

 

[sergiomb]

here it is an example HTH Resolved - Suexec - Use Custom CGI binary

 

[Bitpalast]

@nicksti

Premature end of script headers: index.php
Error parsing script headers
AH01075: Error dispatching request to :

The script contains an error that it never finishes. It can be a bracket issues (missing closing brackets in some places) or a simply php opener/closer issue or a while...next loop that never reaches its exit condition. Also very common are "includes" that point to a non-existent file or even better an URL that does not delivered the required resource.

@sergiomb
How is that related to the initial question?

 

[sergiomb]

Sorry I though I read error "End of script output before headers" when is "Premature end of script headers: index.php"