First, try to connect to the network with another computer. The last computer may have a network card fault. If not, check whether the local network is disconnected. If the local network is disconnected, the problem lies in the routing path. Just restart it or replace it with a new routing path.

2. Secondly, check whether the error light of DSL modem is on. If so, turn off the modem and restart it, or you need to turn off the computer and unplug all kinds of devices, wait for 3 seconds, then reconnect them to the computer and restart it.

3. The above method still doesn't work. Try resetting the network connection in Windows system. Follow the following steps in Windows XP, click Start, Run, enter CMD and press enter, then enter ipconfig /renew and press enter. Or you can right-click the network connection icon in the system tray and select the repair option. But I find the former more effective.

4. If your computer still can't connect to the Internet after all this trouble, and you usually connect to the Internet through a wireless adapter, then try to connect directly to the router through a network cable. Still not working? Forget the router and see if you can connect directly to other computers through a modem, which will help to further find out the root of the problem. In addition, carefully check all cables and, if possible, replace them all.

5. Still doesn't work? Call your broadband provider and ask them to check whether the same problem exists in the surrounding area. Don't forget to pay attention to the obvious: if you surf the Internet through cable broadband, have you checked whether there is a signal on cable TV? Have you paid the relevant fees? ) Some service providers can remotely test your network equipment; Sometimes the ISP will send a reset signal to your modem. But at this time, you are likely to encounter the fault of the network itself, which is usually temporary, but reporting the fault and making complaints-constantly complaining-usually helps the ISP solve the fault more efficiently.

to avoid the recurrence of the problem: buy some spare network connection devices-find the Wi-Fi signals of neighboring friends and ask their permission to use them, or buy wireless data transmission cards for notebooks.

2. What should I do if the computer can't connect to the network?

The first thing is to see if someone is surfing the network. If not, it may be that the connection is unstable. If you still remember the password of the broadband account, restore the router to the factory and reset it. If it is still the case, try another router to see if it is the same. If it is still the case, see if there is something wrong with your network card and driver. If not, That's the problem with broadband service. 1. We click the right mouse button on the network connection. 2. Click "Open the network and enjoy the center". If you are XP, click "Online Neighborhood"-> Attribute 3. Find and click "Local Connection" in the window. If it is XP, click the right mouse button on "Local Connection"->; Status 4. Then we can click "Details" and XP users can click "Support".

5. After the fourth step, users above win7 can view their current IP address, if your IP address does not start with "169.x.x.x". Then you are indeed connected to the network.

Otherwise, maybe the network cable can only send packets, but can't accept packets. We can see the packet reception status in the "local connection" property! The data packets are changing, so there is really no problem with the network connection. 6. If not, we click "Properties" after the third step of the method, and the same is true for XP system.

7. After clicking the attribute, we find it in the line of "TCP/IPxxx" in the attribute window, and then click "Attribute" 8. Then we check "Use the following DNS server address" 9. Enter four groups of 114 in the server address, and then click the OK button! Open the webpage again to see if it has been successfully opened! 1. If it doesn't work, press WIN+R key, enter "cmd" in the running box, then press Enter 11, enter ping Group 4 114, press Enter to execute, or ping gateway address. When ping Group 4 114, the time= displayed at the back is a number, which proves that your computer is a DNS problem. Use housekeeper+anti-virus software to repair it. If timeout is displayed, it means that the computer has no access to the Internet or is banned or connected to the network. Please combine the first method and the second method to change the gateway address to 1 at the end of the IP address you are viewing. For example, if my IP is 192.x.x.1, then the gateway is: 192.x.x.1 ping the gateway address. If timeout is displayed, it proves that the connection between you and the router is open to the public! Network cable? Network card? Please have three more ways to eliminate it.

3. What if the computer can't receive network data and can't get online?

The computer can't receive network data and can't get online for the following reasons: 1. The chip is overheated due to poor heat dissipation, which affects the working performance.

2. Electromagnetic interference. 3. The router network cable connection is loose.

4. The router is aging. The solutions are as follows: 1. Place the router in a ventilated and open place.

users who often hang up to download can install radiators if possible. 2 .. Try not to use wireless mouse and keyboard, especially near wireless devices such as set-top boxes.

keep away from microwave ovens and radiation sources of cordless phones. If possible, you can replace the 5Ghz router to avoid the congested 2.4Ghz band.

3. check whether the connection between the WAN port and the LAN port of the router is loose, and reconnect to ensure reliable connection. 4. Open Tencent Computer Manager-Toolbox-Network Repair-Repair immediately.

5. Replace the router.

4. What's going on when the computer can't connect to the network?

There are many broadband connection errors 691 (access denied due to invalid user name or password on the domain)/635 (unknown error). The processing flow is as follows: (1) User name and password are incorrectly filled; (2) If the user account password is correctly filled, proceed to the next step to continue processing; It is suggested to rebuild the dialing software (if you don't know how to install the dialing software, please refer to the user again):? If it is normal after reinstalling the dialing software, the reason is "the dialing software is lost"; ? If the fault still exists after reinstalling the dialing software, please call customer service number 1 Telecom (16 Netcom /15 Tietong) to declare the fault.

broadband connection error 691 error 691 in a real sense: 1. There is an error in the domain name (user name or password entered incorrectly). 2: The server does not respond, (the user port in the computer room is wrong, or the account is not activated).

3: telephone or broadband due to arrears. Reasons for error 691 1. Telecom has limited the number of accounts you can use. For example, your account can be used by four people, and now four people are using it. It is an error 691 2. You didn't disconnect after using it, at least the server side didn't disconnect, thinking that you are still using it, similar to the above situation, so error 691 suggests: right-click the broadband connection every time you turn it off, and don't keep pestering and dialing after the error 691 occurs. Wait a few minutes and try again. If this happens all the time, call the customer service number 1 Telecom (16 Netcom /15 Tietong) and tell the staff that your computer error 691 can't get on. Then she asks, "What's your broadband number?" Tell her your account, and then she sometimes asks you who opened the account and answers who opened it. Then in a few minutes, she will find someone to help you fix the broadband connection error 691, one of the solutions to solve the ADSL inexplicable error 691. There is a wireless router in the office of the factory, and the broadband is newly installed at home, so I only use an ADSL account to surf the Internet with my brother, and a network cable is plugged in between two laptops.

But it's depressing that you can connect to the Internet when you plug it into my laptop, but when you plug it into my laptop, you always get the error 691: wrong user name/password. But what is certain is that I definitely didn't enter the wrong user name or password, so I can't set it in the dialer and the phone for a long time! ! ! Depressed.

when calling 1, the telecom lady insisted that I made a mistake, not their problem.

Later, I searched the Internet for some related articles and finally solved the problem-it turned out that Telecom bound my ADSL account with my brother's laptop card. The solutions are as follows (refer to the article "Easily modify the MAC address of the network card under Win2/XP" by Xiao Chao): 1. Run on the eldest brother's mobile phone (enter "cmd" to bring up the command line), check the network configuration information, find out the PhysicalAddress in the local connection, and record it.

2. enter my notebook, enter the device manager, find the network card in the network adapter, right-click the name of the network card to select properties, enter the "advanced" tab, select the item wotkAddress in the box on the left, select the "value" on the right, and fill in the MAC address just recorded (case-insensitive, don't add the "-"symbol). Maybe we will meet in the future, so please learn! ! ! Broadband connection error 623 (phone book item not found) Step 1: Is there any software such as firewall or 3721 Internet Assistant? If there is, it is recommended to exit (1) Post-test of firewall and 3721 Internet Assistant: If the fault is solved, "user software problem"; (2) If the fault still exists, proceed to the next step to continue processing; Step 2: instruct the user to check the status of the network card and plug in the network cable: (1) If the fault is solved, the cause of the fault is "pc hardware problem"; (2) If the fault still exists, proceed to the next step to continue processing; Step 3: When the conditions are met (there is dial-up software and installation CD (Win98 should be equipped with a network card driver), it is suggested to delete and try again: (1) If the fault is solved, it is a "pc hardware problem"; (2) If the fault still exists, proceed to the next step to continue processing; Step 4: If all the above processes are invalid or simple coordination operation is impossible, please call customer service number 1 Telecom (16 Netcom /15 Tietong) to report the failure of broadband connection error 678 (the remote computer is not responding). The processing flow is as follows: Step 1: Check whether the MODEM signal light is normal, and restart the modem if it is abnormal.

if it is normal, see step 2. Step 2: Ask the user if there is any software such as firewall or 3721 Internet Assistant, and if there is, advise the user to exit (1) Post-test of firewall and 3721 Internet Assistant: If the fault is solved, the fault reason is "user software problem"; (2) If the fault still exists, proceed to the next step to continue processing; Step 3: instruct the user to check the status of the network card and plug in the network cable: (1) If the fault is solved, fill in: the fault reason is "pc hardware problem"; (2) If the fault still exists, proceed to the next step to continue processing; Step 4: When the conditions are met (users have dialing software and install CD-ROM (Win98 should have network card driver disk), users are advised to delete the dialing software and install the dialing software after reinstalling the network card driver: (1) If the fault is solved, fill in: the fault phenomenon is "dial-up connection timeout" and the fault reason is "PC hardware problem"; (2) If the fault still exists, proceed to step 7 to continue processing; Step 5: Judge whether the telephone line behind the MODEM is available and whether the separator is connected correctly: (1) If the telephone line behind the modem cannot be used, but other telephones with billing numbers can be used, it is recommended to replace the telephone line, and the fault reason is "user indoor line fault"; (2) If all the telephones of the user's home billing number can't be used, please call the customer service number 1 Telecom (16 Netcom /15 Tietong) to declare the obstacle.

step 6: if all the above treatments are invalid or the user can't do simple cooperation, please call the customer service number 1 Telecom (16 Netcom /15 Tietong) to declare the obstacle. The broadband connection error 645 is caused by the damaged dialing software file (common in XP system), and the processing flow is as follows: Step 1: If the conditions are met (the user has dialing software), it is recommended to reinstall the dialing software: if the fault is solved, the fault is the original.

5. Why can't I receive data on my computer network connection?

I need to set IP address, gateway and DNS server, as follows: First, check the setting parameters of the network card in my neighbor's computer (what do you think? Open "Start-Settings-Network Connection-Local Connection", then click "Properties", click "TCP/IP" in "This connection uses the following items", and then click "Properties" on the lower right to see all the set parameters), and record the setting parameters of your neighbor's network card (.

finally, open your network card settings page in the same way, and fill in the neighbor's network card settings parameters. The only thing that needs to be changed is the last digit of your IP address. If his IP address is 192.168.1.2, then the last digit of your IP address cannot be 2, but should be changed to 192.168.1.3 or 192.168. After setting up, you can surf the Internet (some machines may need to be restarted to take effect).

6. What if the computer can't connect to the network?

82 doesn't recognize the card provided.

please check whether the card is inserted correctly and whether it is inserted tightly. The link has been configured to verify the identity of the access server, and Windows cannot verify the digital certificate sent by the server.

8 cannot establish a VPN connection. The VPN server cannot be connected, or the security parameters of the connection are not configured correctly.

Inter connection cannot be enabled due to IP address conflict on the network * * * Enjoy 798No certificate can be found for use with Extensible Authentication Protocol. The connection to the remote computer could not be established because the modem could not be found or was busy.

796 The service type RADIUS attribute of this user is neither a frame nor a callback frame. 795 The user's tunnel type RADIUS attribute is incorrect.

794 the user's frame protocol RADIUS attribute is not PPP. 792 L2T