Dns Server Not Responding Troubleshooting Flow

How to Fix “DNS Server Not Responding” Error on Windows & Mac: Complete Guide

Published: September 9, 2026 • by
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Few computer errors are as frustrating as losing internet access while your Wi-Fi icon still shows “Connected.” When you open your web browser, instead of loading your favorite site, you are greeted with a bleak error: “DNS Server Not Responding” or “Server IP address could not be found.”

The Domain Name System (DNS) functions as the phonebook of the internet, translating human-readable domain names (like smartguidepulse.com) into machine-readable IP addresses (like 144.76.111.139). When your DNS server fails to respond, your computer cannot translate these addresses, cutting off web browsing entirely.

Follow our systematic, step-by-step troubleshooting workflow below to resolve this error on both Windows and macOS platforms.

Quick Guide Directory

1. Quick Troubleshooting Check (Before Changing Settings)

Before modifying network adapters, rule out simple temporary hardware glitches:

  • Test Multiple Devices: Try opening a website on your smartphone connected to the same Wi-Fi. If your phone also fails, the problem lies with your router or ISP, not your computer.
  • Power Cycle Your Router: Unplug the power adapter of your modem/router, wait a full 30 seconds to allow the capacitors to discharge, and plug it back in. This clears internal routing caches.
  • Try an Alternative Web Browser: Test whether Chrome, Edge, or Firefox produces the same error to rule out browser profile corruption.

2. Flush DNS Cache and Renew IP Address (Windows)

Over time, your operating system stores temporary DNS lookup records. If a website changes servers or your cache becomes corrupted, flushing the DNS table resolves the conflict instantly.

  1. Press Windows Key + S, type cmd, right-click Command Prompt, and choose Run as administrator.
  2. Execute the following commands one by one, pressing Enter after each:
ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
netsh winsock reset

Once complete, restart your PC and test your connection.

3. Flush DNS Cache on macOS

If you are on an Apple Mac computer running macOS Sonoma or Sequoia:

  • Open Terminal (Press Command + Space, type Terminal, and press Return).
  • Type the following command and press Return:
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

Enter your Mac user password when prompted and press Enter.

4. Switch to High-Reliability Public DNS Servers

By default, your router uses the DNS servers assigned by your Internet Service Provider (ISP). ISP DNS servers frequently suffer downtime, throttling, or slow lookup queries. Switching to free, high-speed public DNS providers like Cloudflare or Google Public DNS reliably resolves DNS server errors.

Configuring DNS on Windows 11:

  1. Open Settings > Network & internet > Advanced network settings.
  2. Click on your active connection (Wi-Fi or Ethernet), then click Edit next to DNS server assignment.
  3. Change the setting from Automatic (DHCP) to Manual and toggle IPv4 on.
  4. Enter the following Cloudflare DNS values:
    • Preferred DNS: 1.1.1.1
    • Alternate DNS: 1.0.0.1
  5. (Or use Google DNS: 8.8.8.8 and 8.8.4.4).
  6. Click Save.

Configuring DNS on macOS:

  1. Open System Settings > Network.
  2. Click your active network connection, then select Details.
  3. Navigate to the DNS tab.
  4. Click the + button under DNS Servers and add 1.1.1.1 and 8.8.8.8.
  5. Click OK and then Apply.

5. Disable Secondary Network Adapters and VPNs

Virtual network adapters installed by VPNs (Virtual Private Networks), VMware, or VirtualBox can interfere with standard DNS resolution:

  • Disconnect from any active VPN software.
  • Press Windows Key + R, type ncpa.cpl, and press Enter to view all network connections.
  • Right-click any unused adapters (such as Bluetooth network connections or virtual adapters) and select Disable.

6. Update Network Adapter Drivers

Corrupted or outdated wireless card drivers frequently drop DNS socket bindings. Visit your device manufacturer’s website (e.g., Dell, Lenovo, HP, ASUS) or Intel Driver Support Assistant to download the latest Wi-Fi and LAN drivers for your motherboard.

Summary Checklist

In many common network scenarios, flushing your local DNS cache and switching your primary DNS to Cloudflare (1.1.1.1) or Google (8.8.8.8) fixes the “DNS Server Not Responding” issue permanently while improving your overall web browsing speeds.

Understanding the Root Causes of DNS Server Failures

When Windows or macOS displays the message “DNS Server Not Responding”, your operating system is unable to translate alphanumeric website domain names (such as example.com) into their corresponding numerical IP addresses (such as 93.184.216.34). This breakdown can happen at three distinct junctions in your networking stack:

  • Local Operating System Cache: Corrupted DNS lookup tables in your computer’s memory preventing fresh lookups.
  • Local Gateway / Router: The DNS relay service built into your consumer Wi-Fi router freezing or losing upstream connectivity.
  • ISP DNS Server Outage: The default recursive resolvers assigned by your Internet Service Provider experiencing downtime or severe throttling.

Advanced Network Diagnostic: PowerShell nslookup

To test whether your issue is truly DNS-related rather than a total physical disconnect, open Terminal or PowerShell and type: nslookup google.com 1.1.1.1. If Cloudflare’s resolver responds with IP addresses, your physical connection is active and the issue lies strictly with your default DNS resolver.

Top Public DNS Resolvers Compared

Switching from unreliable ISP servers to an anycast public DNS resolver improves both resolution speed and browsing privacy:

Provider Primary IPv4 Secondary IPv4 Key Advantage
Cloudflare 1.1.1.1 1.0.0.1 Fastest lookup latency & strict privacy (no logging)
Google Public DNS 8.8.8.8 8.8.4.4 Global redundancy & enterprise stability
Quad9 9.9.9.9 149.112.112.112 Built-in malware & malicious phishing domain blocking

Frequently Asked Questions on DNS Errors

Why does restarting my router sometimes fix DNS errors?

Most residential Wi-Fi routers run an internal lightweight DNS proxy daemon (such as dnsmasq). If the router undergoes high concurrent NAT session load or loses temporary synchronization with upstream carrier nodes, its internal DNS cache becomes unresponsive. A 60-second power cycle resets the router’s routing tables and forces fresh handshakes.

Is IPv6 DNS necessary to configure?

If your ISP assigns dual-stack IPv4/IPv6 connections, your operating system may prioritize IPv6 DNS lookups. For Cloudflare, enter 2606:4700:4700::1111 and 2606:4700:4700::1001 in your IPv6 properties to prevent IPv6 DNS fallback timeouts.

If you continue experiencing recurrent networking dropouts, read our step-by-step tutorial on securing your home Wi-Fi router network and our deep dive on clearing browser cache and temporary sockets.

Technical RFC Standards & DNS Documentation

Sources & Further Reading

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FA

Written by Fahad Ali

Founder & Technical Editor

Fahad Ali is the founder and technical editor of Smart Guide Pulse. With a background in web systems, cloud infrastructure, and software workflows, he writes and curates step-by-step operating system troubleshooting guides, software reviews, and practical productivity tutorials.