The statement is false because while changing the default port can reduce the surface visibility to automated attacks or scans, it is considered security by obscurity, which is not sufficient as a standalone security measure. Attackers can still discover services on non-standard ports using port scanning techniques. Proper security controls require the implementation of additional measures such as firewalls, intrusion prevention systems, and stringent access controls.
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What is security by obscurity?
What are some examples of proper security controls?