DNS errors are among the most common reasons for sudden internet connectivity issues. When you see a message like “DNS Server Not Responding” or “DNS_PROBE_FINISHED_NXDOMAIN,” it means your computer cannot connect to the system that translates website names into IP addresses. This guide provides clear, actionable steps to help you troubleshoot and resolve these errors quickly.
Understanding DNS and Why Errors Occur
The Domain Name System (DNS) acts like the phonebook of the internet. When you type a website address like “google.com” into your browser, the DNS translates that human-readable name into a numerical IP address that computers use to communicate. If this translation process fails, your browser cannot find the website, resulting in a DNS error.
These errors can stem from several sources, including outdated software settings, router glitches, or issues with your Internet Service Provider (ISP). Fortunately, most DNS problems are local to your device or network and can be fixed with a few simple adjustments. By following the steps below in order, you can identify the cause and restore your connection.
Step 1: Restart Your Router and Computer
The most effective first step for almost any technical issue is a simple restart. This clears the temporary memory (cache) on your devices and forces them to establish a fresh connection with your network. This process often resolves minor software glitches that cause DNS communication failures.
- Power down your computer: Shut down your device completely rather than just putting it into sleep mode.
- Unplug your router: Disconnect the power cable from the back of your router and modem.
- Wait 30 seconds: This allows any residual electricity to dissipate, ensuring a full reset.
- Reboot: Plug the modem and router back in, wait for the lights to stabilize, and then turn on your computer.
Step 2: Clear Your Web Browser Cache
Sometimes, your web browser saves outdated or corrupt DNS information. When you try to visit a site, the browser uses this old data instead of looking for the current, correct address. Clearing your browser’s cache and cookies can often resolve specific DNS errors that only appear in one browser.
To do this in most modern browsers like Chrome, Edge, or Firefox, go to the Settings menu and look for Privacy and Security. Select the option to “Clear Browsing Data” and ensure that “Cookies” and “Cached images and files” are selected before clicking the clear button. Restart the browser and try the website again.
Step 3: Flush Your DNS Cache
Just as your browser stores data, your operating system maintains its own “DNS cache.” This is a local record of all the websites you have visited recently. If the IP address of a website has changed and your computer is still using the old one stored in its cache, you will encounter an error.
For Windows Users:
- Press the Windows Key and type “cmd.”
- Right-click on Command Prompt and select “Run as Administrator.”
- Type
ipconfig /flushdnsand press Enter. - You should see a message confirming that the DNS Resolver Cache was successfully flushed.
For Mac Users:
- Open Terminal (found in Applications > Utilities).
- Type
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponderand press Enter. - Enter your administrator password if prompted.
Step 4: Change Your DNS Servers
By default, your computer uses DNS servers provided by your Internet Service Provider. If the ISP’s servers are slow or experiencing an outage, you will have trouble browsing. You can manually switch to public DNS servers, such as those provided by Google or Cloudflare, which are often faster and more reliable.
To change your DNS settings on Windows, go to Settings > Network & Internet > Change adapter options. Right-click your connection, select Properties, and click on Internet Protocol Version 4 (TCP/IPv4). Select “Use the following DNS server addresses” and enter these popular options:
- Google DNS: Preferred: 8.8.8.8 | Alternate: 8.8.4.4
- Cloudflare DNS: Preferred: 1.1.1.1 | Alternate: 1.0.0.1
On a Mac, go to System Settings > Network, select your connection, click Details, and then navigate to the DNS tab to add these addresses using the “+” icon.
Step 5: Disable VPNs and Antivirus Software Temporarily
Virtual Private Networks (VPNs) and third-party antivirus programs often intercept your internet traffic to provide security. However, if these programs are misconfigured or experiencing a bug, they can block DNS requests entirely. To test if this is the cause, temporarily disable your VPN and any third-party firewall or antivirus software.
If your internet begins working immediately after disabling these services, you may need to update the software or reset its settings to the default configuration. Remember to re-enable your security software once you have identified the problem to keep your system protected.
Step 6: Reset the TCP/IP Stack
If the previous steps have not worked, there may be a deeper issue with how your computer handles network protocols. You can reset the TCP/IP stack, which essentially reinstalls the core rules your computer uses to connect to the internet. This is a safe and effective way to clear out persistent configuration errors.
On Windows, open the Command Prompt as an administrator again. Type the following two commands, pressing Enter after each one:
netsh int ip resetnetsh winsock reset
After running these commands, you must restart your computer for the changes to take effect. This process returns your network settings to their original factory state without deleting any of your personal files.
Step 7: Check for Network Driver Updates
A network driver is the software that allows your operating system to talk to your hardware (like your Wi-Fi card). If this driver is outdated or corrupt, it can lead to intermittent DNS failures. You can check for updates by right-clicking the Start button and selecting Device Manager.
Expand the Network adapters section, right-click on your primary adapter (usually labeled as Wireless or Ethernet), and select Update driver. Choose the option to search automatically for drivers. If you are on a Mac, these drivers are updated automatically with macOS system updates, so ensure your OS is fully up to date.
Conclusion
DNS errors are frustrating, but they are rarely permanent. By following these troubleshooting steps—from simple restarts and flushing your cache to changing your DNS servers—you can resolve the vast majority of connectivity issues on your own. Most users find that the problem is solved within the first three steps of this guide.
If you have tried all these steps and still cannot connect, the issue may lie with your Internet Service Provider. In such cases, contacting their technical support team is the best next step. For more help with home technology and internet troubleshooting, explore our other guides on SearchAndHelp.com to keep your digital life running smoothly.