Asus RT-AC66U Not Connecting to Internet? – Complete Guide

After plugging in your router, you find your Asus RT-AC66U not connecting to Internet. Your devices will show no Internet access, and you will become frustrated.

Luckily, we can help you!

Some users claim that their Asus router is working properly, but it isn’t connected to the Internet and isn’t transmitting data to and from the web. Others didn’t set up their devices properly.

We've got you covered if you are also having difficulty connecting to the Internet!

To fix the Asus RT-AC66U not connecting to Internet, first, check for an outage. You may not be able to connect to the Internet because the server is down. Then, reboot your router to refresh your connection.

Before proceeding to the solutions, let us discuss the possible reasons you are receiving a no Internet error.

What Causes Asus RT-AC66U No Internet Error

There are several possible culprits that can cause your Asus RT-AC66U to not connect to the internet properly.

The main one to look out for is using the wrong settings for your network.

Your router needs to be set in such a way that allows it to connect to your internet provider.

Here are the top issues that could have occurred to your Asus router whenever it doesn’t connect to the internet.

1. Service Outage

The server is down. Either an overload of people is accessing the Internet, or a circuit of gridlocks is causing the web pages not to load.

2. Connectivity Issues

There may be an unexpected network failure. Make sure you connect your device properly to rule out problems that affect your Internet connection.

3. Incorrect Internet Settings

Your router settings are not automatically set up to get an IP address. If you set up your computer properly, you can minimize issues and continue as usual.

4. Outdated Firmware

Your Asus router is having connectivity issues because you failed to update your device. You missed out on some important features, bug fixes, and security patches.

5. Minor Bugs And Glitches

Temporary loss in Internet service is often caused by bugs and glitches. They occur due to errors within the system.

These are the possible reasons for your Asus RT-AC66U not connecting to the Internet.

Let us now move on to troubleshooting your device.

How to Fix Asus RT-AC66U Not Connecting to Internet

Before you go ahead and get to the solutions on how to fix your Asus router that’s not connecting to the internet, we recommend that you reboot your router.

It’s a quick fix that can save you a lot of time if it works.

However, if it doesn’t, let’s move on to the rest of these surefire solutions so you can resolve this issue in no time!

Solution #1: Connect Your Modem to Your Router Properly

Rebooting your router usually helps and resolves the issue. However, in the case that it doesn’t, you want to make sure that your connections are correct.

First of all, the Asus RT-AC66U is a router and requires a modem to connect to the internet.

Connecting both your modem and router is a pretty straightforward process, and all you need is an ethernet cable.

You also want to make sure that the connections are secure and not loose to avoid any sudden internet emergencies.

Here’s how to connect your modem and router:

1. Plug one end of the ethernet cable into your modem’s WAN port.
2. Plug the other end to your router’s WAN or Internet port.
3. Give your router at least 2 to 3 minutes to connect.

Tip: You want to make sure that the ethernet connectors are locked into the ports.

Solution #2: Update Your Device’s Network Adapter Drivers

Your device’s network adapters are the next things you want to check if your Asus RT-AC66U is not connecting to the internet.

Connectivity issues can arise when your network adapters use years-old drivers to connect to your router.

Whether you’re using a wired or WiFi connection, it’s recommended that you check your network adapter drivers and update them regularly.

Outdated drivers can cause incompatibility issues that can cause this error.

Here’s how to update your network adapter drivers:

1. Click the Start button on your computer and type in Device Manager.
2. Scan the list and look for Network adapters. Expand it.
3. Click on the network adapter you’re currently using.
4. Select Update driver.
5. Choose the Automatic search option.

Note: It’s recommended that you restart your computer for the changes to take effect.

Solution #3: Perform a DNS Flush

Your DNS cache is essential to your network as it acts like an address book allowing your network to convert domain names to IP addresses.

One of the reasons why your router is having a hard time connecting to the internet is a corrupt DNS cache. This can cause Internet connectivity problems and even security problems.

Now, your DNS cache should clear out automatically. That’s why you’re not always suffering from connection issues.

However, there are circumstances that can occur which can lead to a perfect mix, and you’ll need to resort to flushing your DNS cache.

Here’s how to flush your DNS cache:

1. Right-click on the Start button on your computer.
2. Select Command Prompt (Admin).
3. Type ipconfig /release, then press Enter.
4. Next, type ipconfig /renew.
5. Finally, type ipconfig /flushdns, then press Enter.

Note: These commands will help you get a new IP address and clear the DNS cache on your router.

Solution #4: Set WAN Connection Type to Automatic

If your router is not connecting to the internet, one of the reasons is that it’s unable to acquire an IP address from your provider.

The main reason why this happens is that your router’s settings are not set to get an IP address automatically.

Whenever this happens, your router’s WAN or Internet LED notification light will light up red, indicating that it’s not connected to the internet.

To fix this, you’re going to need to get into your router’s settings.

Here’s how to do it:

1. Log in to your Asus router’s admin dashboard.
2. Go to Advanced Settings, then scroll down to WAN.
3. Change the WAN Connection Type to Automatic IP.
4. Click on Apply to save your changes.

Note: Also, make sure that the other settings, such as Enable WAN, are set to Yes.

Solution #5: Update Your Router’s Firmware

You’re not doing yourself and your router any favors running it on outdated firmware. It’s going to be prone to a lot of problems ranging from security to connectivity.

The most common one you’re going to face is your router won’t be able to connect to the internet.

To avoid and remedy this situation, you’re going to need to download the latest firmware for your router.

It helps to update your router’s firmware so you won’t have to worry about incompatibilities with your device’s network drivers.

Here’s how you can do that:

1. Log in to your router’s admin dashboard via a web browser.
2. Go to Administration, then System.
3. Select Firmware Upgrade.
4. Wait for a few minutes for the update to finish.

Note: You can also check the top-right corner for an update notification.

Solution #6: Perform a Network Reset on Your Computer

Lastly, if you’re still having issues with your router not connecting to the internet, you can perform a network reset.

Doing this should refresh all your connections and allow your devices to connect to your router properly.

Essentially, this gives your network a reboot by starting everything from scratch.

Although it’s a little forgiving compared to a factory reset since you don’t need to reconfigure your settings.

Here’s how to perform a network reset:

1. Open your computer’s Settings.
2. Go to Network & internet.
3. Select Reset now.
4. Click Yes to confirm your action.
5. Restart your computer.

Note: Your computer should download and set everything up for you after it restarts.

That’s it! Your Asus RT-AC66U is now connected to the internet. If nothing seems to work, you can also try resetting your router to factory settings, as that can also resolve this particular issue.

You’ll have to reconfigure your network, but it beats not being able to connect to the internet. You can also contact Asus customer support for additional assistance.

Read Next: Asus Router Connected But No Internet?

Bottom Line

Now that you know the reasons why your Asus RT-AC66U not connecting to internet, you can now attempt to fix it.

Use our solutions to help you make sense of the problem so you can take the necessary steps to resolve it.