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Table of Contents
1. Check if the password is correct
2. Reconnect after forgetting the network
3. Check router settings or restrictions
4. Update the system or reset the network settings
Home Common Problem How to fix wifi authentication error

How to fix wifi authentication error

Jul 26, 2025 am 12:25 AM
wifi 認證錯誤

When encountering Wi-Fi authentication errors, you should check whether the password is correct, try to forget the network and reconnect, troubleshoot router settings or restrictions, and update the system or reset network settings. First, make sure that the entered password is correct, pay attention to case and special characters, and can be verified with other devices; if the password is correct but still cannot be connected, you need to manually "forgot" the network in the device and reconnect; then check whether the router has enabled MAC address filtering, whether there is IP address conflict or security protocol mismatch; finally consider updating the device system or resetting network settings, computer users can also try to refresh the IP address, and most problems can be solved through the above steps.

How to fix wifi authentication error

Wi-Fi authentication errors are problems that many people encounter when connecting to the network. This problem is usually not that the router is broken, but that there is something wrong with the setup or the device itself. The key is to find out the specific errors and then prescribe the right medicine.

How to fix wifi authentication error

1. Check if the password is correct

This is the most common reason. Entering the wrong password will cause authentication to fail. Especially case, special characters and numbers are easy to be confused.

How to fix wifi authentication error
  • If you are not sure if your password is correct, you can try:
    • Connect on other devices to see if it will succeed.
    • Check if there is a default password on the back of the router, or contact someone else at home to confirm the current password.
    • Pay attention to turning off the automatic filling function when entering to avoid mistakenly filling in old passwords.

If you are using a phone, sometimes the keyboard will automatically hide the password, and line breaks or accidentally touching spaces will also affect the result.


2. Reconnect after forgetting the network

Some devices may keep reporting errors even if you change your password after saving the error message. At this time, you need to manually "forget" the Wi-Fi network and reconnect it again.

How to fix wifi authentication error

Operation steps (taking Android as an example):

  • Open Settings → Wi-Fi
  • Find the network name where the problem → Click the settings icon
  • Select "Forgot this network"
  • Click on the network again and re-enter the password to connect

iPhone and Windows computers also have similar operation paths.


3. Check router settings or restrictions

Sometimes the problem is not on your device, but on the router. for example:

  • MAC address filtering : Some routers set to allow access to only specific devices. If you change to a new device, you may be blocked outside.
  • IP address conflict : Multiple devices obtain the same IP address, which may also cause authentication failure.
  • Security protocol mismatch : For example, the router uses WPA3 encryption, but some old devices only support WPA2, and they will not be able to connect.

You can log in to the router background to check these settings, or try restarting the router.


4. Update the system or reset the network settings

Sometimes there will be compatibility issues after the system is updated, especially after the Android or iOS upgrade to a large version.

Recommended operations:

  • Check if the device has system updates
  • Try "Reset Network Settings" (Note: This will clear all saved Wi-Fi passwords)
  • If it is a computer, you can use the command prompt to run ipconfig /release and ipconfig /renew to refresh the IP

Basically these common methods. In most cases, first check from the password and device side. If it still doesn’t work, then consider router settings or system issues. Not too complicated, but it is easy to ignore details.

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