Case 1: ADSL ISP server failure.
Case 2: Network card failure.
Case 3: Network protocol error caused by abnormal shutdown.
Two, in view of the above situation, the following methods can be used to remove obstacles:
Method 1: Check whether ADSL signal lamps can be synchronized correctly.
Method 2: Check whether the network card is normal.
Method 3: Remove all network components and reinstall the network.