Why can't I get in?

The reason why I can't get in is probably because of network delay or failure. I suggest you try a better network environment.

Solution: Right-click My Network Places to see if the Local Area Connection is connected correctly. If bifurcation occurs, it can be judged that the network connection is not good. At this point, check whether the RJ-45 interface (network card interface) is loose and plug it in again. If not, check whether the network interface between the machine and the hub or switch is loose.