RJ45 network port security lock, with professional unlocking tools, for servers, computer office network equipment and terminal some security protection products deployed, can be illegal connection to the Internet and other public networks for protection, for the deployment of e-government network and e-government external network units, in the use and maintenance process is very easy to cause network mixed connection security risks, In many cases, users accidentally insert private networks into the Internet without their knowledge or negligence. The private network interface plug-in product redefines the general network interface plug-in and provides prevention and control measures for illegal outgoing communication in the private network interface plug-in mode, reducing security risks caused by misoperations of users who connect private devices to non-private networks and non-private devices to private networks.