Desktop, win 10 system, no local connection, an Ethernet, unable to connect to the network.

First, check the network cable to make sure there is nothing wrong with it. I met a friend who repaired the computer before and said that I couldn't get online. The result was solved for a long time, and finally it was found that the network cable was not plugged in or there was something wrong with the network cable. In order to avoid this embarrassing phenomenon, we must first make this situation clear, otherwise we will find that the network cable is not plugged in after a long investigation. This is a "wise man's half-assed son". If you draw a big red cross on the network icon in the lower right corner, first check whether the network cable is plugged in. If the network cable is plugged in and works normally, the yellow light will always flash next to the place where the desktop computer is plugged in and the laptop computer is plugged in. If the indicator light doesn't flash, it means that the network cable is not plugged in or plugged in, and it doesn't work. Second, re-obtain IP address information When the network can't connect, the first thing that comes to mind is to check your own IP address information. We can enter ipconfig or (ipconfig /all for details) at the command line (cmd) to view it. If we get the IP address of the normal network segment of our company, or the IP network segment set by the router at home, this is normal. If the IP address information is not the network segment set in your own environment, this is an abnormal situation, and you need to reset the IP or get the IP address again. If the following situations occur or the IP address starts with 169, the network card has not obtained the correct IP address. If we get the IP address of the Internet through DHCP, we can use the ipconfig /release command to release the existing IP address information, and then use ipconfig /renew to get the appropriate IP address from DHCP. This method can solve some situations where correct IP address information and DNS cannot be obtained. Sometimes, if you manually configure an IP address in an environment using DHCP, it will be within the connection acceptance limit, or an exclamation point will be displayed on the network icon! At this time, it is necessary to set the IP address to dynamic acquisition. Ipconfig /release publishes address information. Ipconfig /renew gets new address information. Third, diagnose network connection and solve network problems. There is a good tool in Windows called "Windows Network Diagnosis", which can help us find out the causes of some problems. Turn on the network adapter of our computer. If the laptop is wirelessly connected to the network, it means turning on our wireless network adapter. At this time, you can click "Diagnosis" on the lower right to open the Windows network diagnosis for inspection: a wizard will pop up for automatic diagnosis. In some cases, it will be repaired automatically, and some problems can be solved by using Windows diagnosis. If related problems are detected, they can be repaired according to the problems found. Fourth, broadband connection Many friends are using dial-up Internet access, obviously the account password has been set correctly. But I still found that the network connection was limited. ADSL virtual dial-up Internet access is based on PPPoE, which is equivalent to establishing a dial-up virtual circuit between your machine and ADSL office, so the normal use of this virtual circuit is not limited by local connection or disconnection (of course, the virtual circuit runs on the real circuit, and your network card, ADSL modem and ADSL access equipment in the office must first establish a physical connection to make this virtual circuit work normally, but the local connection in the physical connection does not need to be allocated in the software system. This is a situation where some users find that they have actually dialed the number but still have connection problems. At this time, you need to ensure your computer's IP address and networking equipment (router, etc.). ) are all on the same network segment. The method is to open the control panel-Network Connections, find the current local connection, right-click, select Properties, double-click Internet Protocol (TCP/IP) in the General tab, and choose to use the following IP address. Generally, fill in "192.65438+" in the IP address. If the problem is not solved, please note that IP must be on the same network segment as the IP address of ADSL modem. If the current computer joins a workgroup or domain, it should be set according to the situation. Sometimes, you can delete the "Notify me when this connection is restricted or disconnected" option from the "Properties" of the local connection of the network connection. V. Network card driver Recently, many friends reported that when upgrading from Windows7 to Windows8, they found that the network connection was limited or unable to connect. At this time, it is necessary to ensure that the upgraded network card driver is correct. Sixth, network operators When we enjoy the Internet services provided by operators, don't forget that sometimes some of the reasons for not being able to access the Internet come from operators. I couldn't get online in the dormitory before, and then several people in the dormitory kept checking. Finally, I found out that the result of calling the telecom customer service was arrears. In some cases, it is account binding or something. When you can't get online, you might as well call the operator of your choice. It is also important to remember all kinds of codes, such as 65 1, 678, 69 1, when you can't access the internet or have problems with dialing, which are important basis for us to troubleshoot.