Recently built an nginx server that supports PHP on Centos 7. nginx, PHP and php-fpm were all installed using yum and used normally.
But because other programs need to occupy port 9000, the configuration in /etc/php-fpm.d/www.conf is changed:

listen = 127.0.0.1:32328

After modification, php-fpm cannot be started, and the error message is as follows:

Permission denied error occurred
The strangest thing is that after changing it back to 9000, it can start smoothly again!
Tried to modify the listen owner, listen group and listen mode in /etc/php-fpm.d/www.conf

listen.owner = nginx listen.group = nginx listen.mode = 0666

I also turned off the Centos 7 firewall, but still got the same error
Could you please tell me what the problem is, thank you!