Broadband network error 678, only two lights on

1. Broadband Internet display "error 678", it is caused by modem damage, poor contact of network cable and network card, ** line obstruction, etc., if there is a router, it is recommended that you can first power off and restart, if it is still not available, it is recommended that you remove the router and check whether the modem signal light is normal:

1. If it is normal, please try to restart the network card, unplug the network cable, and restart the modem;

2. If it is not normal, please try to unplug the ** cable, restart the modem, check whether the separator is connected correctly and unplug the above cable.

2. If it cannot be solved, you can contact the local manual customer service for feedback.

Mobile broadband users log in with an error**678 is usually caused by a line issue and can be recovered by following these steps:

Restart the modem and plug the fiber connector back in before surfing the Internet.

Determine the status of the modem indicator, for example, whether the WAN indicator is solid or flashing when the port is connected to the modem normally;

Remove the router, create a broadband connection, and reconfigure the router;

If the above methods still do not solve the problem, you can call the local 10086 to report the broadband fault.

There's a small hole in the cat, and you hold it down with a toothpick for about 5 seconds before the program starts.

Let's see if the local connection is wrong! Mine is like that, and then changed it, it's good, the first light on the hair is on after the power is energized, the second is the ** data, the connection is normal after the light is on, if it is not lit and flashing, it is a line problem, the third is when the Internet is flashing, if it is not on, it is off, you don't have to worry about this, the fourth is the direct connection between the cat and your computer network card, steady on and flashing means normal, if it is off, it is not right to check whether the line between the cat and the network card is normally connected!

1. Check whether there is a problem with the line (network cable).

2Re-enter the account and password, 3 There is a reset button (reset) behind the cat is more hidden! Press for 5 seconds to connect the light on the cat after normal!

If the LOS light on the optical modem turns red or flashes, it is generally faulty, as follows:

1. There is a problem with the optical interface of the optical modem, and the optical modem needs to be replaced.

2. The indoor pigtail connection optical cat connector is loose, and the connector can be restored by plugging it in;

3. The bending of the indoor part of the optical fiber is too large. Excessive bending of the optical fiber will affect the total reflection transmission of the optical signal in the optical fiber, as long as the optical fiber is straightened;

4. If the optical fiber of the outdoor part is broken or the optical port of the equipment in the computer room is faulty, it is necessary to report the broadband fault, and there will be staff to come to the door to troubleshoot the fault after the fault report.

1.Wrong account or password (usually not).

2.Call ** to Telecom, they will test your modem data (you have to turn on the computer), if it can't be measured, it proves that there is a problem with the line or the modem is broken, you can call the telecom to repair the line or go to the telecom to replace the modem.

3.Create a network connection 2 in the online neighborhood, and network connection 3 to see if it can connect to 4If the network card is damaged, try it with a network card that is sure it is okay.

5.If the port is damaged, call Telecom to replace the port and try.

6.If none of the previous ones are true, then there should be a problem with the computer, and you can borrow a laptop to try. Personally, I think it is possible to reinstall the system or overhaul the motherboard.

The network light does not light up means that there is a problem with the connection between the ADSL device and the network card, so it will report 678 when dialing, re-seat the network cable at both ends, if it is still not lit, then change the network cable and try again, the general network card is rarely broken, unless the thunder is split, hehe.

I've solved this before, and I hope it can help you.

Start - Run - Enter cmd Enter - Enter ipconfig all Enter.

Find the physical address and write down the twelve-digit hexadecimal value, for example: ff-ff-ff-ff-ff-ff-ff

Right-click on Properties on the Neighbor Network - On the local connection, right-click on Properties - click "Configuration" - Advanced.

Find the network address in the "Properties" box below, check the "Value" on the right and enter the twelve-digit hexadecimal value you just wrote down, and then change the last digit to whatever you want, such as fffffffffff0 (don't enter the middle -) at this time

Click OK and take a look online.

Reinstall a broadband connection, if it doesn't work, uninstall the network card driver and reinstall one, if it still doesn't work, redo the system, if it doesn't work, then consider the hardware problem.

Hope it helps.

Didn't ping yourself?

Can packets be returned?

If the ping is on, ask them to replace the broadband port for you.

If the ping doesn't work, please replace the 3 things like the cat, network cable, and network card.

Isn't there an interface for the cat to connect the ** wire, you check if there is a problem with the whole ** line.

Whether you have installed some software after reinstalling the system, such as some antivirus software, etc., it is possible that the software has conflicted, it is recommended to uninstall all antivirus software, including some Internet assistants, and turn off Windows Firewall, and try again.

You seem to be using a router, you reset the router and reset it, and the method of resetting is generally to press the reset and then turn on the router for 30-40 seconds.

If the error "678" prompt appears, it is generally that the network is not available, but the network is under normal conditions and the error "678" prompt appears, then it may be that the network is not connected due to the conflict of various application software during your use, and the error "678" prompt will appear.

How to solve the problem that the computer is not connected to the Internet:

1.First, determine whether a single computer can't access the Internet or if all computers in the LAN can't access the Internet. If a single computer cannot access the Internet, in the Windows XP 2000 operating system, click Start All Programs Accessories Communication Network Connection command to open the Network Connection window (you can also right-click the Internet neighbor icon and select the Properties command).

2.Next, check the status of the Local Connection. If the icon of the local connection is upgraded to two small computers shiny, prompting "connected", it means that the line from the switch hub to the computer is normal, the network card can basically work normally, and the inability to access the Internet is caused by improper operating system settings or software restrictions.

Use the ping command to ping the remote host to see if it can be pinged, if it can be pinged, it means that the network connection is normal, and then check the firewall settings and server settings in the computer.

3.If the ping fails, the network protocol configuration may be faulty. Check the configuration of the computer's IP address, gateway, DNS, etc.

4.If the local connection icon in the Network Connections window is grayed out, the local connection (network card) is disabled, so simply double-click the local connection icon to re-enable it.

5.If the local connection icon in the "Network Connection" window prompts "Local cable is unplugged", it means that one end of the network cable connector from the switch or hub to the user's network card is loose or there is a problem with the network cable.

Error 678 is a fault prompt often encountered by broadband ADSL dial-up Internet users, which simply means that the network is not available. Broadband ADSL dial-up Internet access uses PPPoE protocol connection, transmits data through ** line, uses ADSL special modem to realize data modulation and demodulation, the meaning of error prompt 678 is that the remote computer is not responding, which means that the instruction is sent from the computer to the network card to send data outward, including the transmission of ** line, and the port of the terminal board of the local office (telecommunications office computer room end) handles the data transmission problem in the process of returning data to the computer.

1. First of all, confirm that the ADSL modem dial-up is normal or the physical link between the network cable and the switch directly into the home is unobstructed, because the IP automatically obtained by the network card is not cleared, so the network card cannot be obtained when dialing again The new IP address will prompt 678, the operation method is: turn off the ADSL modem, enter the network connection of the control panel and right-click the local connection to select disable, right-click the local connection after 5 seconds to select enable, and then turn on the ADSL modem dial-up; If it is a direct network cable to the home, the user can disable the local connection, select the local connection after enabled, right-click to select the status, check whether the receipt and delivery are normal, and check whether a valid private IP can be obtained (China Telecom has no private network IP, limited to mobile fiber broadband); 2. If the first step is invalid, then in the case of turning off ADSL MODEM, still disable the local connection (network card), restart the computer, and then enable the local connection (NIC) and then turn on ADSL MODEM to solve the problem; 3. If the above steps cannot be solved, check whether the network card light is on, if the network card light is not on, refer to the dispatch knowledge base: "the network card light is not lit or often does not light up" solution 4, if the network card light is normal 1, 2 steps can not be solved, then lead the user to uninstall the network card driver, reinstall the network card driver, if the user XP system according to:

Knowledge number: 9973, how to set up ADSL dial-up connection under WinXP method leads the user to create a dial-up connection, if the 98 system recommends that the user install rasppoe software or ehernet300 software connection. 5. If the above operations do not work, contact the network provider in your region to confirm the port.

Failure of the modem is the main cause.