1, the network is disconnected, but it often shows that it cannot be connected.

2. The network is blocked, which makes it impossible to get the reply package within the default waiting time of the program. 3. The network is unstable, and the network cannot transmit the server information completely.

4. System problem: The system resources are too low to provide enough resources for the program to process server information.

5. Instability of equipment, such as loose network cable and unplugged interface.

6. During the network registration, the system was busy and could not respond.