About: http://webisa.webdatacommons.org/60875596

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	My point is, it is detectable from outside whether you are firewalling something or not because of the mere fact that your TCP stack behaves different when you DROP than to when you do not have a service running in the first place!
http://www.w3.org/ns/prov#wasQuotedFrom	serverfault.com