Error Code 678 usually occurs when your internet connection fails to connect to ISP for any reason or you don’t plugged your internet cable properly.
Error 678: The remote computer did not respond. For further assistance, click More info or search Help and Support Center for this error number.
Fix Error code 678
- Check your cables make sure it is connected properly to your computer network card (Green LED are on) and to your router(if you are using router).
- Check Network Adapter is Enabled vai Network Connection Panel (Start -> Search -> ncpl.cpl).
- Restart your router and computer.
- If you still get this error 678 then you will have to contact your internet service provider (ISO) and seems to be caused by your connection provider. They will fix it for you.