What to do if the port cannot be accessed in centos7 system

Problem:

centos7.3 system, firewalld has been closed, but except for port 22, the other ports cannot be accessed by the outside world, and local access is normal.

Solution steps:

(Recommended tutorial: centos tutorial)

1. First open

firewalld：systemctl start firewalld

2. Open the port

firewall-cmd --zone=public --add-port=8080/tcp --permanent

3. Reload the configuration file

firewall-cmd --reload

At this time, the port can be accessed after testing. If the firewall is not needed, it can be closed again. The open port will not be affected.

Note: Firewall depends on the native python version. If you upgrade the python version, you need to modify the firewall configuration file.

Recommended related video tutorials: linux video tutorial

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