ERROR: unable to bind listening socket for address ‘127.0.0.1:9001’: Permission denied (13)
Cause: php-fpm is not able to start the process on port 9001 because of selinux
Solution : disable selinux and reboot system
vi /etc/selinux/config
SELINUX=enforcing to SELINUX=disabled
reboot the system
check using getenforce