It depends on your specific situation. It is very likely that the network management software was used to allow internal machines to access the network through restrictions, shielding some ports and adding some ACL lists. As long as the address you visit is not allowed, the network administrator will add it when he sees the record, and you can't visit it in the future.
The simple restriction is to set a few rules through the router.
The solution depends on the specific method. If you use network management software, it depends on what kind of network management software. Jusheng network management is probably the most used one now! ! You can find it online, and there are tools to crack the network management of Jusheng.