(As a powerful firewall, the prototype of LooknStop is very strict. First of all, LooknStop first blocks all local and remote network access operations, and then allows it item by item. Because of this too severe strategy prototype, LooknStop can become a "wall" built between the system and the network, and it is precisely because of this model that LooknStop has also caused some users to be unable to connect to the network after installation— - it blocks all packets. So the first thing we have to manage is the first disastrous situation that most users eat when they face LooknStop: unable to connect to the network.)