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We have two computers connected to an ethernet hub and the hub connected to the modem. One computer internet works and the other gets and error 678 message we have interchanged the cables on the ethernet hub and it did not change any thing.

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ERROR 678 is usually a physical connection problem, either between that computer and the modem, or on the provider of the telephone lines side. There can also be a software network addressing problem for the Local Area Connection inside Network Connections inside the control panel, which can cause a physical connection problem in a way, so to speak. Try to ping the router and log in to router interface via internet explorer. If cannot login check the ethernet 1 or 2 or 3 or 4 lights on switch and modem/router, which need to be stable green. Try bypassing the hub/switch and connect the pc directly to the router. Restart everything including pc. Reset router. Try assign the LAN ip addresses and DNS addresses manually instead of automatic - if there's still no LAN connection. Investigate disabling anti-virus or uninstalling it completely, then its probably a port problem at the exchange of the telephone company and a fault needs to be logged with them.

Posted on Aug 18, 2009

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Hiiii
Since internet is working in one of the computer then it seems that the other modem is not working correctly so you must reset your modem.
For further help you can visit http://techbuddies-robin.blogspot.com/2009/06/free-computer-related-technical-support.html

Posted on Jun 19, 2009

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Can I connect Ethernet to the internet without router


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Error 678 and Error 679 Connection Errors
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Both errors are very closely related as they both suffer from the same causes

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You have a phone line problem.
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The Winsock file needs to be repaired.
A phone line does not have a line filter installed.
The modem drivers are corrupt.
Spyware.
Your modem is faulty.
Your username, password is wrong.
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Hi there.
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Step 3: Reset the modem
  1. Disconnect the cable that goes from the computer to the modem.
  2. Turn off the modem. If the modem does not have a power switch, disconnect the power supply from the modem.
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Step 4: Uninstall and then reinstall the modem and the drivers by using Device Manager
Before you follow these steps, you may have to download the latest driver for your network adapter from the hardware manufacturer.
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If you have a Realtek 8139 network adapter, updating the driver seems to resolve this issue. For more information, visit the following Realtek Web site: http://www.realtek.com.tw/downloads/Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. Step 5: Create a new DSL or cable connection
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