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I heard someone saying that a “port should be opened” , said a person inside a closed room in our company. So I wonder that it is possible to close a port ! So is it true that a port can be closed and/or opened ? If so how to close it , and how to open it ?
Depending on you operating system, the firewall can be configured to block traffic on selected ports.
For example, on Windows 7, you can do this by opening the firewall advanced settings and creating a new rule for incoming/outgoing traffic.