How to fix the ERR_NAME_NOT_RESOLVED error on an Android smartphone

Encountering an error ERR_NAME_NOT_RESOLVED in your smartphone's browser is a common situation that completely blocks access to web resources. The problem is not the Internet connection itself, but the device's inability to resolve a site's domain name to its IP address. Simply put, your phone “does not know” where to send the request, even if the communication channel is active.

Most often, this failure occurs due to incorrect operation of DNS servers (Domain Name System), which act as the Internet phone book. The reasons may vary from temporary failures with the provider to incorrect settings on the device itself Android. Sometimes the culprit is an outdated browser cache or conflicting software.

In this guide, we will look at effective methods for diagnosing and troubleshooting the problem. You will learn how to check your network settings yourself, reset DNS settings and return stable access to your favorite sites without contacting a service center. Follow the instructions sequentially to identify the root of the problem.

Connection diagnostics and basic network check

Before delving into complex settings, you need to make sure the physical connection is stable. Often the error occurs because the router has lost connection with the provider or the Wi-Fi signal is too weak to transmit DNS requests. Try opening any other site or application that uses the Internet to confirm access.

If other applications work, but the browser displays an error, the problem is localized in the software or settings of a specific one. browser. However, if the Internet does not work anywhere, try rebooting your router. Disconnect it from the power for 10-15 seconds, and then turn it back on. This action often solves the problem of frozen sessions on the hardware side.

It is also worth checking whether the Airplane mode is activated on the smartphone. Sometimes the system exits this mode incorrectly, leaving network modules in a locked state. Turn this mode on and off via the notification shade to force a restart of the device's radio modules.

Clearing the DNS cache and browser data

The accumulated data in the browser may contain outdated or broken DNS records that prevent pages from loading correctly. Clearing the cache is one of the safest and fastest ways to fix the situation. In the system Android this is done through the app settings, and not just inside the browser itself.

Go to the phone settings and find the section Applications or Application Manager. Find your browser in the list (for example, Chrome, Samsung Internet or Firefox). Inside the application menu, select Storage or Memory. Here you will need to click the button Clear cache.

It is important not to confuse clearing the cache with clearing data. If you click Clear data, you will lose all saved passwords, browsing history and bookmarks. So proceed with caution and select only the option to delete temporary files. After completing the procedure, completely close the browser and open it again.

Changing DNS servers to private ones (Private DNS)

Starting with version Android 9, the system has a function of using private DNS servers, which allows you to bypass restrictions or DNS failures provided by your Internet provider. This is the most effective method of solving the error ERR_NAME_NOT_RESOLVEDif the problem is widespread.

To configure, go to section Settings → Connections (or Network and Internet). Find the item Private DNS (Private DNS). By default, it may be set to "Auto" or "Disabled". You need to select the mode Private DNS provider host name.

In the field that appears you need to enter the address of a reliable server. One of the most popular and stable options is the service from Google. Enter the following value:

dns.google

An alternative option is a server from Cloudflare, which is often faster. To do this, enter the address 1dot1dot1dot1.cloudflare-dns.com. After entering the address, save the settings. The phone may lose connection for a few seconds, after which the connection will be restored through new servers.

⚠️ Attention: When entering a private DNS address, pay attention to the case of letters and absence extra spaces. The Android system is sensitive to syntax, and the slightest typo will cause the Internet to disappear completely.

Reset network settings to factory settings

If manually changing DNS did not produce results, it is possible that critical configuration errors have accumulated in the operating system's network stack. A full network reset will return all Wi-Fi, Bluetooth and mobile data settings to their "out of the box" state. This will not delete your personal files or applications.

Find the System or General settingssection in the settings. Select item Reset settings (or Restore and reset). In the menu that opens, tap on the option Reset Wi-Fi, mobile data and Bluetooth. Confirm the action by entering the screen unlock PIN code.

After rebooting the device, you will have to re-enter passwords for all Wi-Fi networks to which you previously connected. You will also need to pair your Bluetooth headsets or watch again. However, this step ensures that any hidden conflicts in network profiles are removed.

Action	What is saved	What is deleted	Execution time
Clearing the browser cache	Passwords, bookmarks, history	Temporary website files	1 minute
Change Private DNS	All phone data	Current settings DNS	2 minutes
Reset network settings	Photos, applications, contacts	Wi-Fi passwords, Bluetooth pairs	5 minutes
Reset to factory settings	Nothing (without backup)	All data and settings	30+ minutes

Checking the date and time on the device

A trivial, but often ignored, reason for SSL and DNS errors is incorrectly set time on the smartphone. Security protocols require time synchronization with the server to verify certificates. If your phone's clock is slow or fast even by a few minutes, the browser may block the connection, interpreting this as a name resolution error.

Check the settings in the Date and timesection. Make sure that the switch Automatic time adjustment (or Use network time) is activated. If the function is enabled, but the time is still incorrect, try turning it off, setting the exact time manually, and then turning it back on.

This problem is especially common after changing time zones or travel. In such cases, the communication module may not have time to update data from the cell tower. Manual synchronization through the settings menu usually instantly resolves the error issue ERR_NAME_NOT_RESOLVED.

Why does time affect DNS?

The HTTPS protocol uses digital certificates that have an expiration date. If the time on the device does not match the real time, the browser considers the certificate invalid and breaks the connection before the content download stage, producing an error similar to a problem with DNS.

Temporarily disabling VPN and antiviruses

Third-party applications for security or bypassing blocks can intercept network traffic and spoof DNS requests. If such an application fails, it stops forwarding requests, generating a name error. This is a common situation when using free versions of VPN services.

Try to completely disable the VPN client or antivirus. In some cases, simply switching the toggle switch is not enough - it is better to force stop the application through the settings (Settings → Applications → Your VPN → Stop). After that, check the availability of sites.

If the error disappears after disabling protection, the problem lies in a specific application. Try updating it to the latest version or changing the server within the VPN itself. If the problem persists only with the antivirus turned on, perhaps its firewall is too aggressive and is blocking legitimate requests.

⚠️ Attention: Menu interfaces and item names may vary slightly depending on the shell version (MIUI, OneUI, ColorOS) and Android version. If you do not find the "Private DNS" item, try searching through your phone settings.

Additional methods and user questions

In rare cases, the problem may be associated with an Internet provider whose DNS servers experienced a global failure. If none of the above methods help, try connecting to a different Wi-Fi network or using mobile data. If everything works on another network, then the problem is solely on the side of your home provider.

It is also worth checking the hosts file if you have root access, although this is rare for ordinary users. Viruses-miners or adware can register blockages there. In this case, it is recommended to scan the device with an antivirus, for example Dr.Web or Kaspersky.

Why does the error only occur in Wi-Fi, but the mobile data works?

This indicates a problem with your router or home Internet provider. The router may not correctly obtain DNS addresses from the ISP. Try rebooting the router or setting DNS (8.8.8.8) directly in the settings of the router itself via the web interface.

Could this error be a sign of a virus?

Yes, some types of malware replace DNS settings in order to redirect you to phishing sites or block access to anti-virus resources. If resetting the network settings does not help and the error returns, perform a full system scan.

What to do if the Private DNS input field is inactive?

This can happen if you have the "Always on VPN" mode activated in the security settings. Disable this mode to unlock the ability to change DNS servers. Also, the function may not be available on very old versions of Android (below 9.0).

Does saving traffic affect the appearance of this error?

Yes, the "Data Saver" mode in the Chrome browser passes requests through Google servers to compress data. If these servers are temporarily unavailable or blocked by your ISP, an error will occur. Try disabling traffic saving in your browser settings.