When you are ready to get online and your browser throws a “DNS server not responding” error, the interruption is maddening. In plain English, your device has lost contact with the server that translates website names into IP addresses, so the page cannot load.

If the networking terms in this article feel abstract, the complete VPN guide explains the tunnel, exit IP, and encryption model before you troubleshoot this specific case.

Key Takeaways

What a DNS error means: Your device has temporarily lost the internet’s “address book.”

Main causes: Stale local DNS cache, a router glitch, or a failed default DNS server from your ISP.

Fast fixes: In most cases, restarting the router, flushing the DNS cache, or switching to a secure third-party DNS such as Cloudflare 1.1.1.1 solves the issue.

What does “DNS server not responding” mean?

Without DNS resolution, your computer does not know which server to contact, so websites will not open. Common culprits include:

Corrupted or expired DNS cache
Conflicting local network or router settings
A failed default DNS server from your ISP
A firewall or poor security app blocking outbound DNS requests

From my monthly testing routine, the fix is usually quick once you isolate the layer causing the failure. Work through the steps below in order.

5 practical ways to fix DNS errors

1. Restart all of your network devices

It sounds like generic support advice, but it is the highest-value first move. A restart clears stale connection state and lets your devices negotiate a fresh network session.

Fully shut down your computer or phone instead of only putting it to sleep.
Unplug your modem and Wi-Fi router, then wait at least 30 seconds.
Plug the router back in and wait until the status lights return to normal.
Turn your device back on and reload the website. If it works, you are done; if not, continue.

2. Flush your system DNS cache

Your computer stores recently visited domain-to-IP mappings. If that notebook contains an old or wrong address, your system may keep taking the wrong route even when the website is healthy.［2］

On Windows:

Open Start and type “cmd.”
Right-click Command Prompt and choose “Run as administrator.”
Type ipconfig /flushdns and press Enter.
Windows should confirm that the DNS Resolver Cache was successfully flushed.

On macOS:

Press Command + Space, search for Terminal, and open it.
Run sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder.
Press Enter, type your Mac password, and press Enter again. It is normal for the password field to stay blank while you type.

3. Switch to a secure third-party DNS server

If you rely on your home ISP’s default DNS, failures are not rare. You can manually switch to public DNS servers such as Cloudflare 1.1.1.1 or Google 8.8.8.8.［1］

If digging through adapter settings and IPv4 properties feels tedious, use a quality VPN with encrypted DNS built in. That also answers a bigger question: what can a VPN hide? It can encrypt your DNS requests so your ISP can no longer inspect them as easily.

4. Disable IPv6 temporarily to test compatibility

IPv6 is widely promoted, but some older routers and local ISPs still handle it poorly. That mismatch can cause connection failures.

On Windows, press Win + R, type ncpa.cpl, right-click your Wi-Fi or Ethernet adapter, choose Properties, uncheck “Internet Protocol Version 6 (TCP/IPv6),” and confirm.

5. Update outdated network adapter drivers

If the root cause is old firmware or an outdated driver, the error may keep returning. An outdated network adapter driver can prevent your device from passing network requests correctly.

On Windows, open Device Manager, expand Network adapters, find your wireless or wired adapter, right-click it, and choose Update driver.

6. Temporarily disable extra security software or try Ethernet

Overactive antivirus tools and firewalls can also block DNS traffic. Try disabling Windows Defender or a third-party firewall for about 10 minutes. If websites immediately load, the firewall policy is likely the problem.

If you are on Wi-Fi, test with a physical Ethernet cable connected directly to the router. That helps separate DNS issues from weak wireless signal or interference.

7. Test another device and reset the router if needed

Connect another phone or computer to the same Wi-Fi and check whether it also shows “DNS server not responding.” If a second device fails too, the issue likely sits with your router connection or an ISP outage.

As a last resort, hold the router’s Reset pinhole for about 10 seconds to restore factory settings. Afterward, use our VPN installation and network reset guide to reconfigure the connection.

Summary: you can usually fix it yourself

Most “DNS server not responding” errors are temporary routing failures, not catastrophic outages.
Restarting the router and flushing the DNS cache are the best first fixes.
You can avoid many ISP-side DNS problems by switching to a secure DNS provider or using an encrypted tool with reliable tunnel support.

FAQ

Is a DNS error the same as “cannot connect to Wi-Fi”?

No. “Cannot connect to Wi-Fi” means your device is not connected to the router. You can still have full Wi-Fi bars and get a DNS server error if the router cannot resolve addresses on the wider internet.

Why does only one device have the problem on the same home network?

If only one device fails while others work, the issue is probably inside that device. Flush its DNS cache, test IPv6 settings, and update network drivers before restarting the entire household router.

Can changing to public DNS affect my speed?

Yes, and often in a positive way. Many ISP DNS resolvers get congested. Public DNS providers such as Cloudflare 1.1.1.1 can resolve domains faster and often perform better in streaming buffer and speed tests.

Can cheap free VPNs cause DNS failures?

Absolutely. Many “free and fast” proxy apps do not use real tunnel encryption and may silently add interception rules or change adapter settings. If errors appear after you close one, remove it and switch to a provider with a proper audit history.

Is flushing DNS cache safe? Will it delete browsing history?

It is safe. Flushing DNS cache only resets your system’s domain lookup records. It does not delete browser cookies, saved passwords, bookmarks, search preferences, or personal files.

Disclaimer: This article is for general informational purposes only and does not constitute legal, technical, or other professional advice. We make no guarantees regarding the accuracy, completeness, or timeliness of the content.

AethoVPN does not replace the non-network steps in “How to Fix the DNS Server Not Responding Error”.

Sources:

Cloudflare - What is DNS? — https://www.cloudflare.com/learning/dns/what-is-dns/
Microsoft - Fix Wi-Fi connection issues in Windows — https://support.microsoft.com/en-us/windows/fix-wi-fi-connection-issues-in-windows-9424a1f7-6a3b-65a6-4d78-7f07eee84d2c

Sources checked 8 May 2026.

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