Cause:
Firewall problem
Solution:
Method 1: Turn off the firewall
[root@localhost ~]# service iptables stop #关闭防火墙 [root@localhost ~]# service iptables start #开启防火墙 [root@localhost ~]# service iptables status #查看防火墙状态
The command to operate the firewall in cenOS7 or Red Hat7 has changed. The command is as follows:
[root@localhost ~]# systemctl stop firewalld.service #关闭防火墙 [root@localhost ~]# systemctl start firewalld.service #开启防火墙 [root@localhost ~]# systemctl status firewalld.service #查看防火墙状态
Method 2: Open the specified port
[root@localhost ~]# vim /etc/sysconfig/iptables :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited
Note: Find the line -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
and add ## after this line #-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT , you can open the 8080 port
[root@localhost ~]# service iptables restart #重启防火墙才能生效
[root@localhost ~]# firewall-cmd --zone=public --add-port=8080/tcp --permanentsuccess [root@localhost ~# firewall-cmd --reload #开放端口只需需要重启防火墙才能生效success
Remarks:Open port command explanation
-zone Scope
-add-port=8080/ tcp Add a port, the format is: port/communication protocol
--permanent Permanently effective
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