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Linux system is famous for its security. By default, there are only 22, 80 and other ports open by default, so we need to manually open the ports we need to use. Let's share the specific methods of opening designated ports for Linux.

Method one

CentOS:

1. Open firewall systemctl start firewalld 2 and open designated port firewall-cmd-- zone=public-- add-port=1935/tcp-- permanent command meaning:-- zone # scope-- add-port=1935/tcp # add port, format: Port / communication protocol-- permanent # takes effect permanently Fails after restart without this parameter 3, restart firewall firewall-cmd-reload 4, view port number netstat-ntlp / / view all current tcp ports netstat-ntulp | grep 1935 / / View all port usage mode 2 # Open port: 8080

/ sbin/iptables-I INPUT-p tcp-dport 8080-j ACCEPT

Mode 3-An INPUT-m state-state NEW-m tcp-p tcp-dport 8080-j ACCEPT

Service iptables restart

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