Common network faults and solutions

April 16, 2020

1. Failure phenomenon: The network adapter (network card) setting conflicts with computer resources.

Analysis, elimination: By adjusting the IRQ and I / O values ​​in the network card resources to avoid conflicts with other computer resources. In some cases, conflicts with other resources need to be adjusted by setting jumpers on the motherboard.

2. Failure phenomenon: other clients in the Internet cafe LAN can see each other on the "Network Neighborhood", but only one computer can't see it, and it can't see other computers. (Prerequisite: The LAN of the Internet cafe is connected to a star network structure through HUB or switch)

Analysis and exclusion: Check whether this computer system is working properly; check the network configuration of this computer; check whether the network card of this computer is working properly; check whether the network card settings on this computer conflict with other resources; check whether the network cable is broken Open; check whether the network cable connector is in normal contact.

3. Failure phenomenon: There are two network segments in the LAN of the Internet cafe, and all computers in one network segment cannot access the Internet. (Prerequisite: The LAN of the Internet cafe is connected to two network segments through two HUBs or switches)

Analysis and elimination: The trunk lines of the two network segments are broken or the joints at both ends of the trunk lines are bad. Check the settings of the network segment in the server.

4. Failure phenomenon: All the computers in the LAN of the Internet cafe can see each other on the "Network Neighborhood". (Prerequisite: The LAN of the Internet cafe is connected to a star network structure through HUB or switch)

Analysis, exclusion: Check whether the HUB or switch works normally.

5. Trouble phenomenon: A client in the Internet cafe LAN can see the server on the "Network Neighborhood", but it can not access the Internet. (Prerequisite: The server refers to the computer on the Internet on the other LAN of the proxy Internet cafe, the same below)

Analysis, exclusion: Check the TCP / IP protocol settings of this client, check the settings of the IE browser in this client, and check the settings for this client in the server.

6. Failure phenomenon: all computers on the entire LAN in the Internet cafe cannot access the Internet.

Analysis and exclusion: Whether the server system works normally; whether the server is disconnected; whether the modem works normally; whether the central office works normally.

7. Failure phenomenon: In the Internet cafe LAN, except for the server that can access the Internet, other clients cannot access the Internet.

Analysis, exclusion: Check whether the HUB or switch is working properly; check whether the network part (including: network card, network cable, connector, network configuration) of the server and HUB or switch is working properly; check whether the software for proxy Internet access on the server is normally started and running; Whether the setting is normal.

8. Trouble phenomenon: When dialing to access the Internet, there is no dialing sound from MODEN, the Internet cannot be connected at all times, and the indicator light on MODEN does not flash.

Analysis and exclusion: Whether the telephone line is busy; whether the connection of the server connected to MODEN (including: connection, connector) is normal; whether the telephone line is normal, whether there is noise interference; whether the dial-up network configuration is correct; whether the configuration setting of MODEN is correct, check Whether the tone or pulse mode of the dial tone is normal.

9. Failure phenomenon: The system cannot detect MODEN (if MODEN is normal).

Analysis, exclusion: reinstall MODEN, pay attention to the correct position of the communication port.

10. Failure phenomenon: The speed of connecting to the Internet is too slow.

Analysis and exclusion: Check whether the connection speed of the port set by the server system in the "Dial-up Network" is the maximum value set; whether the line is normal; the connection speed can be improved by optimizing the MODEN setting; the Internet speed can also be improved by modifying the registry ; Whether there are many clients surfing the Internet at the same time; if there are many, it is normal to make the connection speed too slow.

11. Symptom: The prompt box of "Error 678" or "Error 650" appears on the computer screen.

Analysis and exclusion: Generally, the server line you dialed is busy and busy, and cannot be connected temporarily. You can continue to redial after a while.

12. Failure phenomenon: The error "680: No dial tone. Please check whether the modem is properly connected to the phone line." Or "There is no dialtone. Make sure your Modem is connected to the phone line properly." Appears on the computer screen. frame.

Analysis and exclusion: Check whether the modem works normally and whether it is turned on; check whether the telephone line is normal, whether it is correctly connected to the modem, and whether the connector is loose.

13. Failure phenomenon: The prompt box "The Modem is being used by another Dial-up Networding connecTIon or another program. Disconnect the other connecTIon or close the program, and then try again" appears on the computer screen.

Analysis, exclusion: Check if another program is using the modem; check if there is a conflict between the modem and the port.

14. Failure phenomenon: The prompt box "The computer you are dialing into is not answering. Try again later" appears on the computer screen.

Analysis and elimination: the telephone system is faulty or the line is busy, please dial it later.

15. Symptom: The prompt box "ConnecTIon to xx.xx.xx. was terminated. Do you want to reconnect?" Appears on the computer screen.

Analysis and elimination: The interruption of the telephone line interrupts the connection between the dial-up connection software and the ISP host, and will try again later.

16. Failure phenomenon: the prompt "The computer is not receiving a resp ** e from the Modem. Check that the Modem is plugged in, and if necessary, turn the Modem off, and then turn it back on" appears on the computer screen frame.

Analysis, elimination: Check whether the power of the modem is turned on; check whether the cable connected to the modem is correctly connected.

17. Symptom: The prompt box of "Modem is not responding" appears on the computer screen.

Analysis, elimination: indicates that the modem does not answer; check whether the power of the modem is turned on; check whether the cable connected to the modem is properly connected; the modem is damaged.

18. Failure phenomenon: "NO CARRIER" prompt message appears on the computer screen.

Analysis, exclusion: indicates no carrier signal. This is mostly an abnormal shutdown of the modem application or a telephone line failure; check whether the cable connected to the modem is properly connected; check whether the power of the modem is turned on.

19. Symptom: The prompt box of "No dialtone" appears on the computer screen.

Analysis, exclusion: no dial tone; check whether the telephone line is properly connected to the modem.

20. Symptom: When the prompt "Disconnected" appears on the computer screen.

Analysis, exclusion: indicates that the connection is terminated; if the prompt appears when dialing, check whether the power of the modem is turned on; if the prompt appears during use, check whether the phone is being used by someone.

21. Failure phenomenon: "ERROR" prompt box appears on the computer screen.

Analysis and elimination: it is an error message; whether the modem is working properly and whether the power is on; whether the command being executed is correct.

22. Symptom: When the prompt "A network error occurred unable to connect to server (TCP Error: No router to host) The server may be down or unreadchable. Try connecT In gagain later" appears on the computer screen.

Analysis and troubleshooting: indicates a network error, possibly a TCP protocol error; there is no route to the host, or the server is shut down and the connection cannot be made. At this time, only try again.

23. Symptom: When the prompt "The line id busy, Try again later" or "BUSY" appears on the computer screen.

Analysis, exclusion: indicates that the line is busy, only retrying at this time.

24. Failure phenomenon: When the prompt "The option timed out" appears on the computer screen.

Analysis, elimination: indicates that the connection timed out, mostly due to communication network failure, or the called party is busy, or the input URL is wrong. Check with the central office whether the communication network is working properly. Check if the input URL is correct.

25. Symptom: When the prompt "Another program is dialing the selected connection" appears on the computer screen.

Analysis, exclusion: indicates that another application is already using the dial-up network connection. Only after stopping the connection can we continue our dial-up connection.

26. Failure phenomenon: garbled characters appear when browsing Chinese sites with IE browser.

Analysis and troubleshooting: Chinese characters caused by incompatible Chinese and Western software in IE browser will be displayed as garbled characters. You can try NetScape's browser to see it; the Chinese code used in China is GB, and Taiwan uses BIG5 Chinese characters are displayed as garbled characters, try RichWin to transform the inner code.

27. Failure phenomenon: The speed of browsing the web is slower than normal.

Analysis and exclusion: The trunk line is congested, resulting in a slower network speed; (normally) There are more people browsing a webpage, resulting in a slower network speed; (normally) There is a problem with Modem settings; has a problem.

28. Trouble phenomenon: Can surf the Internet normally, but always intermittently.

Analysis and elimination: problems with telephone lines and poor line quality; modems are not working properly, affecting the stability of Internet access.

29. Symptom: When dialing on the Internet, no dial tone can be heard and dialing is not possible.

Analysis, exclusion: Check whether the modem works normally, whether the power is turned on, whether the cable is connected properly, and whether the telephone line is normal. (Public Internet News)

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