We check our own server instance and select More>Network and Security Group>Security Group Configuration on the server to be set.
After entering, there will be a default one, and then click Configure Rules
to check whether there is a port number configured for you in the incoming rules. If Just add one if you don’t have one.
The remote link server executes
firewall-cmd --list-ports
If this error occurs
, execute it first
systemctl start firewalld
and then execute
firewall-cmd --list-ports
If the list is empty, it means that your firewall has not released any ports.
For example, if we want to release port 80 here, execute
firewall-cmd --add-port=80/tcp
If the execution is successful, the console will output
and then enter again
firewall-cmd --list-ports
This is to see that the firewall has let go of port 80.