For:
Error 678 is a complex cause, and it is recommended that you follow these steps in cases where your broadband account is normally free of charges:
First, please do not use the router, a single computer connection test is normal.
Second, to differentiate ADSL and LAN barriers:
(a) ADSL: According to the modem link (broadband signal lamp), Ethernet (network card signal light), data (data transmission lights) These three indicators of the working status of the initial troubleshooting.
(ii) LAN: Check local connection status.
1, such as the tip of a fork or hint network cable was pulled out: Check the computer network card interface cable is loose, can be reseated line (conditional to replace the network cable or the interface between the two terminals) Restart the computer, check whether normal.
2, such as prompts the network card is disabled:
Method One: Right click on the Network Neighborhood icon--select Properties--double click on the local connection enabled.
Method Two: Right click on My Computer icon--select Properties, in the pop-up window, select the Device Manager under the hardware-find network adapter under the model-click the right mouse button to enable.
3, such as local connection hint has been connected: unplug the network cable or restart the computer.