access.log we can see the following:
[18-Jan-2018 15:03:38] WARNING: [pool www] child 2148 said into stderr: “ERROR: Unable to set php_value ‘soap.wsdl_cache_dir'”
By default this parameter looks like the following:
php_value[soap.wsdl_cache_dir] = /var/lib/php/wsdlcache
In fact you need to install
php-soap package to get rid of this error
yum install php-soap
If you don’t need soap just comment the line.