Asus router authentication error occurred generally due to some issues in WAN connection or incorrect IP address. Similarly, hardware faults can cause this error as well. As a result, you’re not able to access or modify your router’s settings. Furthermore, your internet connection may not work as well. 

Effective Methods to Fix Asus Router Authentication Error 

Here, we have provided some of the best methods to help you fix this issue on your own. Go through all the steps carefully as one of them will help to resolve your issue. 

Method 1: Check the WAN Connection for the Router

Checking the WAN connection is the first thing you should do to fix the authentication error on your router. If the WAN is not connected properly then you will face the authentication error.

Therefore carry out the following instructions to make sure that it is properly connected. 

  1. Connect the Wireless router to the DC-IN port and connect your computer to the wireless router’s WAN port.
  2. Now, power on the router and use another cable to connect the modem to the wireless router’s WAN port.
  3. Finally, when the router is turned on, install the WAN ethernet cable to the router. 

After completing all the setups, check the issue if it has been resolved or not. 

Method 2: Check the IP Address from the Control Panel

After checking the WAN connection properly, you need to check the IP address as well to get rid of this issue. An improper IP address is a principal factor that halts the server connection to the router.

Therefore, follow these instructions to check the IP address for the router on your computer.

  1. Turn on the computer and open the Control Panel from Windows Search. 
  2. Now, when the Control Panel opens, locate the Network and Internet section from the list and click on that.
  3. After that, click the Network Sharing Center option from the left-bottom corner of the screen.
  4. Next, you have yo select Manage Network Connections button from the top of the screen.
  5. After that, scroll the mouse to the bottom and click the Internet Protocol Version 6 (TCP/IPv6) option.
  6. Right-click the option and select the Properties option from the very bottom of the list.
  7. Now, mark the Obtain an IP address automatically from that section and click the OK button to save the changes.

After setting up the proper IP address for your router, restart the device. If the Asus router authentication error has occurred once again, head to the next method.

Method 3: Update the Firmware of your Device

Firmware is a read-only memory chip inside the router that allows the device to set up the security and administrative settings for the network connections. If you are using an outdated firmware or if it is corrupted then you might face this issue.

Hence, proceed with the steps below to update the firmware of your router.

  1. Turn on the computer and open your default browser. Now, head over to the Asus router’s login page and enter the ID and the Password to get into the page.
  2. Locate the Advanced Section from the top of the screen and click on that option.
  3. After that, you need to click the Administration option and then click the Firmware Update option.
  4. Now, the computer will start checking if there any latest version is available or not for your router.
  5. If there any new version is available, click the Download button next to the title and wait for a minute.
  6. Now, when the download is over, click the Install button below the screen.
  7. At last, follow the on-screen instructions and install the software manual for the router device. Finally, restart the Asus router to see if the issue is fixed and the device is now connecting to the server. 

Method 4: Reset your Router 

If the above solutions don’t work for you, then you can reset your router to fix this issue. Resetting a router will cause the router to revert back to its factory default settings. Therefore, follow the steps below to do so. 

  1. First, locate the reset button of your router. Generally, it is located at the back of the device. You can find it by referring to its manual or searching online. 
  2. Next, get a safety pin, needle or something equally thin to press the button with. Thereafter, press and hold the reset button for about 10 seconds. 
  3. Now, your router’s light will start blinking that it has been reset. After it has rebooted, configure your router’s settings once again and the Asus router authentication error will not occur on your system. You have to now login using the default login credentials.  

Wrapping Up…

To conclude, the methods mentioned above should easily help you to fix the Asus router authentication error if it has occurred on your system. If you are still facing this issue then you need to consult the network operator or get in touch with technical support.