centos7 open the firewall

 #network tools

sudo yum install telnet

# fireall stop

systemctl stop firewalld

systemctl status firewalld

#

#　add the port

sudo firewall-cmd --zone=public --add-port=10050/tcp --permanent

sudo firewall-cmd --reload

sudo iptables-save | grep 10050

#ref

https://www.thegeekdiary.com/how-to-open-a-ports-in-centos-rhel-7/