What is DNS and why do you get this error message?

The Domain Name System (DNS) translates website addresses into IP addresses. Think of DNS as the phone book of the internet.

When you see 'DNS server not responding', your computer cannot connect to the DNS server.

Common causes

  • Problems with your internet provider
  • A router or modem problem
  • Firewall or antivirus software
  • An outdated DNS cache
  • Incorrect network settings
  • VPN software

Quick fixes

Restart your router and modem

  1. Turn off the modem and router
  2. Wait at least 30 seconds
  3. Plug in the modem first and wait until the lights look normal
  4. Then plug in the router
  5. Wait 2 to 3 minutes

Try a different browser

Sometimes the problem lies with your browser. Test with Firefox, Chrome or Edge.

Check other devices

If only your computer has the problem, the cause lies with that device.

Fixing DNS problems on Windows

Flush the DNS cache

  1. Open Command Prompt as administrator
  2. Type: ipconfig /flushdns
  3. Press Enter
  4. Type: ipconfig /release
  5. Type: ipconfig /renew
  6. Restart your computer

Change DNS servers manually

  1. Open Settings > Network & internet
  2. Click your network connection > Properties
  3. Double-click Internet Protocol Version 4 (TCP/IPv4)
  4. Select 'Use the following DNS server addresses'
  5. Enter:
    • Google DNS: 8.8.8.8 and 8.8.4.4
    • Cloudflare DNS: 1.1.1.1 and 1.0.0.1
  6. Click OK

Fixing DNS problems on Mac

Flush the DNS cache

  1. Open Terminal
  2. Type: sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
  3. Enter your password

Change DNS servers

  1. Go to System Settings > Network
  2. Select your connection > Details
  3. Go to the DNS tab
  4. Add: 8.8.8.8 and 8.8.4.4
  5. Click OK > Apply

FAQ

Why does my internet work but I can't open any websites?

This is a classic symptom of a DNS problem. Try flushing the DNS cache and switching to public DNS servers.

Is it safe to use Google or Cloudflare DNS?

Yes, both offer reliable and secure DNS services.

Can a VPN cause DNS problems?

Yes, VPN software can redirect DNS requests. Temporarily turn off your VPN to test.

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