State to check firewall configurations
New in version 2016.3.0.
Checks if there is an open connection from the minion to the defined host on a specific port.
testgoogle: firewall.check: - name: 'google.com' - port: 80 - proto: 'tcp'
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https://docs.saltstack.com/en/latest/ref/states/all/salt.states.firewall.html