RJ45 port lock, blocker and dust protection, set with 10 locks and 1 key LogiLink RJ45 port locks protect your network and system from unauthorized access and prevent accidental or malicious damage to ports. They can also serve as an indicator of inactive or disconnected ports or prevent unauthorized connection of cables or devices when network ports are active. The lock locks and protects the RJ45 port and can be removed with the appropriate key.