What to do if port access is denied under centos7

Problem:

After starting the external service on the centos7 listening port, the port access is denied.

Solution:

You can turn off the firewall directly in the development environment.

(Recommended tutorial: centos tutorial)

1. Turn off the firewall

systemctl stop firewalld

2. Disable the firewall from starting at boot

systemctl disable firewalld

Note: Remember not to turn off the firewall at will in the production environment.

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