The office computer suddenly can t connect to the Internet, so I ask for help

First look at your computer's network card light to see if it is flashing.

Again. Start Control Panel Network Connections Local Connections.

The Local Connection dialog box pops up, click Properties and then Install to add the client, service, and protocol again to install and try again.

See if your DNS server address is wrong.

Click Start at the bottom left of the computer screen, select "Run", enter cmd in the pop-up command box, type ipconfig all in the pop-up box, find the DNS server, and see what the address behind it is, which is the same as your colleague's.

Remove the unused NIC protocol and take a look; If that doesn't work, uninstall the NIC driver and reinstall the NIC driver. It's fine after the restart.

You can see if the service items in the computer have been changed. This has happened to me in my family.

It's one of the problems of the switch, the router, and the cat, so plug the main line connected to the switch into the computer to see if it can be on? You can't try the main thread on the router, and you can finally find the essence of the problem by using the elimination method.

Take a look at the IP protocol and try to choose to get IP and DNS automatically. I've never been in such a situation. This is how my computer is configured.

Can you add that it is completely unavailable on the Internet, or some of the functions are not available. For example, QQ can be on, but IE can't be opened.

Product model: Dell Inspiron 5000, MacBookAir system version: Windows 10,

The computer may not be connected to the Internet may be caused by the wireless network card being disabled, you can enable it, the specific operation steps are as follows:

Windows PC1. Right-click "Start" in the lower left corner of the computer and click "Network Connection".

2. Click "Change Adapter Options".

3. Right-click "WLAN" and click "Enable".

Mac1. Click the Apple logo in the upper left corner and click to enter "System Preferences".

2. Click "Network" and click "Advanced".

3. Select the wifi that can't be connected, click to delete it, and click OK in the lower right corner.

4. Exit the network prompt and click "Apply" to reconnect to the wifi.

Summary. The laptop cannot connect to wifi may be caused by the wireless network card being disabled, just enable it, the specific operation steps are as follows:

Windows PC1. Right-click "Start" in the lower left corner of the computer and click "Network Connection".

2. Click "Change Adapter Options".

3. Right-click "WLAN" and click "Enable".

Mac1. Click the Apple logo in the upper left corner and click to enter "System Preferences".

2. Click "Network" and click "Advanced".

3. Select the wifi that can't be connected, click to delete it, and click OK in the lower right corner.

4. Exit the network prompt and click "Apply" to reconnect to the wifi.

Summary. Hello, happy to answer for you.

In this case, check whether there is a problem with the network connection, whether the IP address of the computer is set correctly, and it needs to be set in the same network segment to be able to connect to the Internet normally.

Hope it helps you and I wish you happiness and happiness every day! 

What should I do if the computer in the office is connected to the Internet at home?

Hello, happy to answer for you. In this case, check whether there is a problem with the network connection, whether the IP address of the computer is set correctly, and it needs to be set in the same network segment to be able to connect to the Internet normally. Hope it helps you and I wish you happiness and happiness every day! 

How do I check the IP address of my computer?

Click Start Menu, Settings, Search Box to search for Control Panel, Enter, click to view network status and tasks, click on connected networks, click on Details, and you can see the information of IP address; At the same time, press and hold the win+r key to open the run, enter cmd, and click OK. RN enters ipconfig, press enter, and you can also see your IP address.

Is your computer connected to the Internet? If it's wireless, did you find an internet connection? And is the network card broken, to check from many aspects? Don't say you can't get on?

Check whether the IP settings and gateway settings of the local connection are the same or similar to those of others (the IP only needs to be different from the last digit, while the gateway needs to be the same).

The question is very vague, can you get on QQ? Do you use Outlook to receive letters?

What do you mean, a broadband, your computer, broadband connection, the connection is not on, you can change to other computers on the broadband connection, yes, there are the following reasons.

1 Your computer's network card is broken.

3 Password error.

First, click on the inter option on the toolbar on the web page --> Advanced --> check.

In the "Execution" field, enter "."to start the HTTP SSL service.

That doesn't work, try this: Click Network & Inter.

Click Set or change your interconnection.

Click the Content tab.

Under Certificates, click Clear SSL Status.

When you receive the confirmation message, click OK.

On the work column, click Start, and then click Go.

Copy the following text and paste it into the "Open" text box:

regsvr32 。

Just restart IE.

If your IP, gateway, and DNS settings are correct, you can only suspect that your company's network is controlled by Internet rules such as MAC filtering, then you need to ask the network administrator.

If you can't see it, tell you the easiest way to check the port of your computer and change it to the computer that can access the Internet, see if you can go up, can you go up to prove that the router port is covered, and if you can't go up to prove that your computer is covered, you can't go up to prove the problem of your computer, and then look for me.

Refill IE If you are an XP system, click Start - Execute - Enter Regedit, press Enter, and open the login file.

Find the Hkey Local Machine Sofare Microsoft Active Setup Installed Components key, right-click and select Modify, change its value from 1 to 0, and then restart the computer, the XP system will install IE automatically

How does your company connect to the Internet?

That's a lot of things.

1) You can start the Internet service under Shutdown.

2) You can add an IP address, (3) You can find a 08 version of QQ. Because the 09 version has added a lot of plug-ins and monitoring.

Describe your failure in detail! Why can't it be on, what errors occur in how to configure, you say this is too general, there is no way to judge the cause of the failure!

If you are using China Unicom Broadband and cannot use it, troubleshoot the problem as follows:

1) Check whether the broadband is in arrears or expired.

2) Check the optical modem, if the optical modem flashes a red light, it means that there is no optical signal source for the pigtail or optical cable leather wire, or the optical cable is hung up, the base station is dropped and other problems, please plug in the optical fiber head or contact the maintenance personnel to deal with it.

3) Check the router, unplug the router, and directly connect to the computer with the optical modem, if you can access the Internet, it means that the router is faulty, and it is recommended not to use the router or contact the router manufacturer for replacement.

4) Check the lines and restart the device, plug in both ends of all the cables, turn off the power of the modem, router, computer and other Internet access devices for a few seconds, and then turn on the power supply and restart.