If you can't open it, you can restart the learning machine, or simply change another network.

The national primary and secondary school network cloud classroom refers to the cloud classroom of the national primary and secondary school network cloud platform based on the national educational resources public service platform. During the epidemic prevention and control period, the Ministry of Education organized China Mobile, China Telecom and China Unicom to expand the service capacity of the national public service platform for educational resources (hereinafter referred to as the national platform), and the Ministry of Education opened the National Network Cloud Classroom for primary and secondary schools through the national platform for teachers, students, parents and social learners to use for free.