one of the new apps we recently installed requested outbound access to port 53 be opened on firewall. Since this port is used for dns, wouldnt this port already be opened or else dns would not be working for network? I have tested to check if an inbound port is open by using canyouseeme.org but how would i test if port 53 is open? If i wanted to test 443 for instance i would try to access an https website and if unable then i know port 443 not open for outbound so how would i do this for port 53? Thanks.