Why can't the computer get online?

When a netizen encounters a computer that can't get online, I believe there are still many netizens who don't know the reason why they can't get online, so I w

When a netizen encounters a computer that can't get online, I believe there are still many netizens who don't know the reason why they can't get online, so I will tell you below, hoping to help you!

Analysis and solutions:

1. A red cross will appear on the local connection in the lower right corner, indicating that the network cable is not inserted correctly.

View the network status in the lower right corner. Usually icons of two small computers.

Analysis steps: test the network cable with a network cable tester or directly change it to a good network cable. If there is a prompt that the local connection is connected, the problem is the network cable. Replace the network cable, or check whether the power of the network device is not turned on. If the power is turned on, try another port. In addition to network equipment, routers, and switches, it is most likely that the network card is damaged, usually after lightning strikes. Try replacing the network card.

Second, there is a yellow exclamation mark on the local connection icon, indicating that the local connection is limited or no connection.

For computers that use routers or switches to access the Internet through routers, limited or no local connection will also make it impossible to access the Internet. Most of the reasons for this failure are that IP is usually obtained automatically, the router is blocked or the server responsible for allocating dynamic IP has connection problems. The easiest way to solve this problem is to assign an IP address to your machine. Right-click Neighborhood on the network, then select Properties, right-click Local Area Connection, then select Properties, select TCP/IP protocol in the pop-up window, and then double-click it. Then: specify your IP address as: 192. 168. 1. * * * * is an arbitrary number between 5 and 252, mainly not to be duplicated with other machines. * * The subnet mask is: 255.255.255.0.

The gateway is192.168.1.1.

DNS: The first one is 202. 102. 128.68, and the second one is 202.102.134.68 * * Others are also acceptable. I filled in our settings * * *

This is the setting of my machine. If the ip and gateway settings of the local network are different, you can ask the network administrator for the settings of IP, gateway and subnet mask.

Third, the local connection in the lower right corner shows that it is connected, but it only sends and does not receive, that is, only the small computer on the left is on, and the one on the right is not. In most cases, there is a problem with the network cable, and the common reason is that the network cable is damaged or aging. Another possibility is that the physical interface of the network card or network device is in poor contact.

Solution: Click Start, execute, then enter cmd and press enter.

Enter ping192.168.1*192.168.1as the IP of the gateway * *.

Refer to the ping command to determine the network failure.

Fourth, qq can get on, and IE can't get on.

In this case, qq can go online, indicating that the network is normal and you can surf the Internet. Unable to browse the web page, there may be a problem with dns or system files.

Execute cmd first. Then ping a website, such as

thump

If something similar is returned.

123.235.44.30 reply: byte =32 time = 155ms TTL=50.

This data shows that there is no problem with dns settings, and the problem lies in the LSp protocol of the system. If the returned is

The Ping request could not find the host. Please check the name and try again.

Then the problem lies in the dns settings.

1. If there is a problem with dns settings, please refer to the settings in II. Manually specify a dns server

2. If the LSP is damaged. First kill the energy consumption of the virus with anti-virus software. It is recommended to use Windows Cleaning Assistant to help clean Trojan horses. Then use the LSP repair function of antivirus software.