10 Lỗi wifi không vào được mạng trên máy tính và cách khắc phục

Wifi has become an indispensable feature on laptops as well as other mobile devices today, giving users flexibility and unlimited network connections. Therefore, the computer’s inability to connect to wifi will cause extreme inconvenience, whether for work or entertainment. In the article below, we list 10 wifi errors that cannot access the network on computers and phones and how to fix them in these cases.

Reasons why the computer cannot connect to wifi

To come up with a correct solution to fix wifi errors on devices such as computers or smartphones, the first thing to do is identify the error that makes wifi inaccessible. Below are some of the most common causes we often encounter.

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Hardware problem

Hardware problems on a computer are problems directly related to the physical components of the machine. This is a fairly easy to recognize error, and is also the main reason why the computer cannot connect to wifi in some of the following cases.

Wifi network card

A Wifi network card is a hardware component inside a computer (laptop or desktop) that connects the computer to a wireless network. When the Wifi network card is faulty, the computer will have difficulty or cannot connect to the Wifi network.

This is shown through some of the following signs:

• Wi-Fi networks not found: The computer cannot scan and find any nearby Wi-Fi networks.
• Unstable Wi-Fi connection: Connection frequently drops, slow speed, or weak signal.
• Can’t access the Internet: Even though I’m connected to a Wi-Fi network, I still can’t access websites.
• The Wi-Fi icon on the taskbar has an exclamation mark or red color: This is a sign that the Wi-Fi network card is having problems.

The cause of wifi network card errors may be due to faulty or not updated network card drivers. Driver is software that helps the operating system communicate with the hardware. If the driver is defective or incompatible, the network card will not function properly. In case the network card is left for too long in a humid environment and is not carefully preserved, damage to the internal components can also lead to the computer or laptop not being able to connect to wifi.

Wifi switch

A Wi-Fi switch is a convenient feature built into many electronic devices, especially mobile devices and laptops. This switch allows users to quickly and easily turn on or off Wi-Fi connections, helping to save battery life and keep information secure.

For computers, the switch is usually a small button with a Wi-Fi signal symbol, usually located on the side or top of the device. In Windows laptops, you can turn wifi on/off via the network icon in the lower right corner of the screen or via the Network and Sharing Center. Therefore, make sure the Wi-Fi switch on your computer is turned on. If it’s turned on but can’t access the Internet, it proves that the device is having a computer error that can’t connect to wifi.

Wi-Fi antenna

The Wi-Fi antenna on a laptop is a small part, usually built into the device, that functions to help the laptop connect to a wireless network (Wi-Fi). It’s like a small “antennae”, helping your computer receive and broadcast Wi-Fi so you can access the internet, send emails, watch movies… without the need for cumbersome cables. Thanks to the antenna, you can connect your laptop to a Wi-Fi network anywhere a signal is available. Check to see if the Wi-Fi antenna is securely connected, if not, it will most likely lead to a wifi error of not being able to access the network on your laptop.

Software problem

Similar to hardware errors, software problems also often occur, causing the computer to not be able to connect to wifi. Below are some common software-related specific causes:

Network card driver is corrupt or not updated

Not being able to connect to the network is the most common sign that the network card driver is faulty or not updated. Your computer will not be able to find or connect to any Wi-Fi or wired networks.

Driver is software that helps the operating system communicate with hardware. If the network card driver is defective or incompatible, the computer will not be able to connect to Wi-Fi. Even when connected, the network signal is often weak and interrupted, affecting internet use.

Software conflicts

Software conflicts are one of the common causes of laptop errors not connecting to wifi. When two or more pieces of software try to access or control a system resource, such as a network card, they can cause conflicts, leading to unstable or interrupted network connections.

Windows Firewall

Windows Firewall is a built-in firewall software in the Windows operating system, which functions as a shield to protect your computer from threats from the Internet. It acts as a gatekeeper, controlling and filtering all data traffic entering and leaving the computer.

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Every time data is sent to or from your computer, Windows Firewall will check and compare it with the rules that have been set up. If a packet does not meet security rules, the firewall will block it, helping to prevent outside attacks such as viruses, malware or hackers. Windows Firewall can sometimes block Wi-Fi connections. That is one of the causes of computer errors not connecting to wifi.

Viruses, malware

Viruses and malware are malicious software that can infiltrate your computer’s system, damage network-related system files, or simply take up system resources, making network connections difficult. unstable.

Malware can change your network settings, such as IP address, DNS, or proxy configuration, leading to connection errors. In addition, viruses and malware can consume too much system resources, slow down your computer and affect network connections.

Network problem

The problem of a laptop not being able to connect to wifi sometimes does not come from the computer device we use, but it is on the wifi transmitter side. Here are some common signs that cause your computer to not connect to wifi.

Weak Wi-Fi signal: The first major sign of this condition is that the Wi-Fi icon on the computer often only displays 1-2 bars instead of the whole thing. Continuously losing connection, connection sometimes works, sometimes not. Not only laptops, but we will also have difficulty connecting to other devices such as phones and tablets.

Faulty Wi-Fi transmitter: When the Wi-Fi transmitter has a problem, your internet connection will be interrupted or the signal quality will be poor.

Network overload: If there are too many devices connected to the network, speed and connectivity will be affected.

How to fix computer error that cannot connect to wifi

After knowing the reason why wifi cannot access the network on computers and mobile devices, we can completely find a way to fix it in the following ways:

Check physical connections

A physical connection on a computer is a direct link between computer devices through physical cables or ports. This is the foundation for data transmission, resource sharing and creation of computer networks.

• Check the network cable: Make sure the network cable connecting from the modem/router to the computer is securely plugged in.
• Check modem/router: Check if the modem/router is working. Sometimes, simply restarting the device can solve the problem.

Check the settings on your computer

Installing Wi-Fi on a computer is the process of setting up the computer to connect to a wireless network. This allows you to access the Internet, share resources, and perform many other online activities.

Restart the computer

This is the first and simplest step to solve Wi-Fi connection problems, including computer errors that cannot connect to wifi. Because rebooting helps reestablish network connections, including Wi-Fi, helping to eliminate temporary connection errors. There are 2 ways to restart the laptop as follows.

Method 1: Use the power button: Press and hold the power button on the laptop until the computer turns off completely. Then, press the power button again to reboot.

Method 2: Use the Start menu

• For Windows laptops: Click the Start icon in the lower left corner of the screen, select the Power icon and select Restart.
• For MacBook running macOS: Click the Apple icon in the top left corner of the screen, select Restart.

After restarting, we will no longer have the error that the laptop cannot connect to wifi.

Viruses, malware

Viruses and malware are malicious software that can infiltrate your computer’s system, damage network-related system files, or simply take up system resources, making network connections difficult. unstable.

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Malware can change your network settings, such as your IP address, DNS, or proxy configuration, leading to connection errors. In addition, viruses and malware can consume too much system resources, slow down your computer and affect network connections.

Check airplane mode

Airplane mode is a useful feature on mobile devices and computers that turns off all wireless connections, including Wi-Fi, Bluetooth, and cellular networks. When this mode is enabled, your device will not be able to connect to any network. Therefore, make sure airplane mode on the computer is turned off so we can connect to wifi on the device and access the Internet as normal.

After turning off airplane mode, go to Wi-Fi settings and make sure Wi-Fi is turned on and the device is searching for networks.

Check the Wi-Fi driver

Make sure the Wi-Fi driver is updated to avoid the situation where your computer cannot connect to wifi. You can find the latest driver on the computer manufacturer’s website or through the sticker on the bottom of the laptop or inside the battery compartment to find the name of the network card.

Scan for viruses

In addition to losing your Wi-Fi connection, you also encounter other problems such as your computer running slowly, strange ads appearing, or unwanted programs when your device is infected with a virus. Therefore, virus scanning is often considered one of the solutions to fix the problem of computers not being able to connect to wifi.

Windows Defender is free antivirus software built into Windows. You can use it for a quick scan or a full system scan. In addition, other software such as Kaspersky, Bitdefender, Avast, etc. often provide stronger protection features and can detect more complex viruses. Select full scan mode to ensure that the antivirus software scans all files and folders on your computer.

Check firewall settings

Firewalls can block network connections. Check if your firewall is blocking your Wi-Fi connection. In addition, some network applications such as VPN can also cause conflicts, you should turn it off to avoid slow and lagging wifi causing discomfort when using the Internet.

Check network settings

To ensure a stable Wi-Fi connection, it is important to check your network settings. The information that needs to be checked is:

• Wi-Fi network name: Make sure the network name is correct and connected.
• Password: Check the password again to make sure it is entered correctly.
• Wi-Fi signal: The Wi-Fi signal must be strong enough to ensure a stable connection.
• IP address: Check if the IP address is allocated correctly.
• DNS: Check DNS servers to ensure DNS is working properly.
• Default port: Check the default port to ensure information is sent correctly.

Note when fixing the error that the computer cannot connect to wifi

When encountering a Wi-Fi error that cannot access the network, taking corrective steps is necessary. However, to ensure the error correction process is effective and safe, you need to note the following points:

Try connecting other devices such as phones and tablets to the Wi-Fi network to see if the error comes from your computer.

Before making any changes to network or system settings, back up important data to avoid information loss. Laptops not connecting to wifi can happen at any time, so be careful about data loss.

Changing network settings incorrectly may cause the computer to become unreachable. If you are unsure, consult the manual or ask someone experienced for help.

If you have tried all of the above and still cannot resolve the problem, contact your Internet service provider or technician for assistance.

Conclusion

The above article summarizes computer errors that cannot connect to wifi. Fixing it is important to ensure you can use your computer normally and take full advantage of the benefits the Internet has to offer. Hopefully this useful information will be applied to you in case of need.

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