Error 503 with PHP

Hello.

I have ISPConfig 3 installed on Centos 7.

I have created a website and the access index.html works fine.
But when I run a php script (https://website.com/site/test.php) it gives ERRO 503 - Service Unavailable!.
The site web have configured "PHP-FPM" and PHP is installed in Centos:

PHP 5.4.16 (cli) (built: Oct 30 2018 19:30:51)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

What could be the problem?.

Thank.

 

Check you are using the same URL for indes.html and test.php. Why is the /site/ in your example URL? Did you copy the test.php script to the web/ directory of the website? So it is in the same dir as the index.html? Are you sure the right index.html is shown? Modify it so it show sthe website name, for example, to make sure.

 

that shows the cli php version. has php been installed and enabled for apache/nginx?

 

Yes, index.html and test.php are in the same directory. The index.html is configured with the name of the website, so I am sure it is that index.

 

php -v:
PHP 5.4.16 (cli) (built: Oct 30 2018 19:30:51)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

I use apache. I don't know if php is enabled. How can I check it?

 

Does ISPConfig Panel work on that host? If yes, then there is PHP installed for web server.

 

Yes, the ispconfig panel work fine, but then I don't understand the problem.

 

The error is:
[Tue Sep 03 18:54:11.705823 2019] [proxy:error] [pid 6359] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/lib/php5-fpm/web1.sock (*) failed
[Tue Sep 03 18:54:11.705880 2019] [proxy_fcgi:error] [pid 6359] [client 192.168.25.2:65502] AH01079: failed to make connection to backend: httpd-UDS

 

I restarted and now it works fine. Thanks!!!