It means that the remote computer has no response, which means that when the computer sends instructions to the network card to send data, including the transmission of telephone lines, there will be a 678 error when the port of the terminal board of the local office (telecommunication bureau room) processes data and returns to the computer. Simply put, it is network paralysis.

The solution is as follows

1. Turn off adsl or modem, enter the network connection of the control panel, right-click local connection to disable, right-click local connection to enable after 5 seconds, and then turn on adsl or modem to dial; If it is a direct network cable, users can disable the local connection and then enable it.

2. Check whether the dialing user name and password are correct. If it is correct, delete the dial-up connection and try a new one.

3. Check whether the network card light is on, whether the network cable is loose or intact, and check whether the network card driver is correct. The network card light is not on. Replace the intact network cable. If it doesn't light up, it means that the network card is broken or the driver is wrong. Replace the new network card or reinstall the network card driver.

4. Check whether the ADSL or MODEM power supply passes and whether the line connection is normal, restart ADSL or MODEM and tighten the connecting cable.

5. If multiple computers use a router to access the Internet, please try to remove the router and connect to the Internet. If you can surf the internet smoothly, it means that the router is faulty, so you should eliminate the router fault or replace it with a new router.

6. Confirm whether it is in arrears. If it is due to arrears, you can pay the broadband fee.

7. Call the operator to confirm whether the operator has a line reason. If you are waiting for the operator to solve the problem, please try again.

References:

Shanghai Telecom teaches you to solve common home broadband faults-Shanghai Telecom? Error 678- Baidu Encyclopedia