How to close the linux port?
How to open and close ports in Linux
1. Check which ports are open netstat -anp
2. Close the port number :
iptables -A OUTPUT -p tcp --dport 端口号-j DROP
3. Open the port number:
iptables -A INPUT -ptcp --dport 端口号-j ACCEPT
4. Save the settings
service iptables save
5. The following is how to use the Linux open port command.
nc -lp 23 &(打开23端口,即telnet) netstat -an | grep 23 (查看是否打开23端口)
6. Linux open port command Each open port needs a corresponding listening program
Recommended Linux video tutorial, learning address: https://www .php.cn/course/list/33.html
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