The background is doing maintenance, networking status, student number and password problems. Maintenance is under way in the background. It is the background of the system under maintenance, and it cannot log in normally during maintenance.

1, networking status. It is a network problem. If you want to log in to the system, you must be connected to the network. If you are disconnected from the network, you cannot log in.

2, the problem of student number password. It's the password of the student number. If you graduate, students who are not in our school cannot log in.