DNS Server Not Found — Causes and How to Fix It Fast

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Last tested: October 22, 2026 · By Alex

DNS Server Not Found means your device cannot reach a DNS server to resolve a domain name. Without DNS, your browser cannot find the website’s IP address.

This is a common network error. It usually comes from DNS settings, connection issues, or server misconfiguration.

You may also see it worded as “DNS Server Not Responding” (Windows) or “Server not found” (Firefox). Both mean the same thing: your device gets no usable answer from its DNS server, and this guide fixes both.

Quick Fix

  • Restart your router and device.
  • Switch DNS to 8.8.8.8 or 1.1.1.1.
  • Flush DNS cache.
  • Disable VPN or proxy.
  • Temporarily turn off antivirus or firewall.
  • Check your internet connection.
  • Try another network.

Most DNS Server Not Found errors are fixed by changing DNS or resetting your network.

What “DNS Server Not Found” Means

When you open a website, your device asks a DNS server to translate the domain name into an IP address.

If the DNS server cannot be reached, the request fails. The browser cannot locate the website.

This means:

  • The DNS server is unavailable
  • The request is blocked
  • Your network cannot access DNS services

The connection stops before reaching the website server.

DNS Server Not Responding

“DNS server not responding” is the same problem: the DNS server did not reply (timeout, overload, or a blocked request). Common messages include DNS_PROBE_FINISHED_BAD_CONFIG in Chrome and Edge, “Server not found” in Firefox, and “DNS server is not responding” in Windows. In most cases the cause is local (device, router, or network), not the website.

Why This Error Happens

DNS Server Is Down

The DNS provider may be offline or not responding.

ISP DNS Problems

Your ISP’s default DNS servers are the most common cause of “not responding”. Temporary outages on the provider’s side also trigger it.

Corrupted DNS Cache

Outdated or damaged cached records can stop lookups from working.

Incorrect DNS Settings

Your device may use invalid DNS servers.

Network Connection Issues

Unstable internet, router problems, or a faulty network adapter can block DNS requests.

VPN or Proxy Interference

Some VPN services use unreliable DNS infrastructure.

Firewall Blocking DNS

Antivirus or firewall software may block DNS traffic.

Router Misconfiguration

Your router may have incorrect DNS settings.

Step-by-Step Fixes

1. Restart Router and Device

Turn off your router for 30 seconds.

Restart your computer and reconnect.

2. Change DNS Servers

Use reliable DNS providers:

  • Google DNS: 8.8.8.8 / 8.8.4.4
  • Cloudflare DNS: 1.1.1.1 / 1.0.0.1

This is the most effective fix.

3. Flush DNS Cache

Windows:

ipconfig /flushdns

Mac:

sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

This removes outdated DNS records.

4. Disable VPN or Proxy

Turn off VPN services and test again.

5. Check Internet Connection

Make sure your network is stable.

Try opening other websites.

6. Reset Network Settings

Windows:

netsh int ip reset
netsh winsock reset

Restart your system after running commands.

Advanced Troubleshooting

Test DNS with nslookup

nslookup google.com

If no response, DNS is unreachable.

Try Another Network

Switch to mobile data or another Wi-Fi.

Check Router DNS Settings

Ensure router uses valid DNS servers.

Disable Firewall Temporarily

Check if firewall blocks DNS traffic.

Does DNS Server Not Found Affect SEO?

Yes.

If DNS fails:

  • Google cannot access your site
  • Pages drop from index
  • Traffic decreases

Fix DNS issues quickly to avoid ranking loss.

How to Prevent This Error

  • Use reliable DNS providers
  • Keep router settings updated
  • Avoid unstable VPN services
  • Monitor network stability
  • Check DNS settings regularly

When to Contact Support

Contact your provider if:

  • DNS does not work on any network
  • Router cannot connect to DNS servers
  • DNS issues persist after fixes

Your ISP or hosting provider can help diagnose DNS problems.

Related DNS Errors

Frequently Asked Questions

What does DNS Server Not Found mean?

Your device cannot reach a DNS server to resolve a domain name into an IP address.

Is “DNS server not responding” the same as “DNS server not found”?

Yes. Both mean your device gets no usable reply from its DNS server. The same fixes apply: restart the router, change DNS to 8.8.8.8 or 1.1.1.1, and flush the DNS cache.

Is this a problem with the website or server?

Usually no. It is a local issue with your device, router, network, or ISP DNS, not the website itself.

Can changing DNS fix it?

Yes. Switching to Google or Cloudflare DNS often resolves it, especially when the ISP DNS server is the problem.

Can a VPN, antivirus or firewall cause this?

Yes. A VPN, proxy, antivirus, or firewall can block or slow DNS requests. Turn them off temporarily to test.

Summary

DNS Server Not Found occurs when your device cannot reach a DNS server.

The most common causes include DNS misconfiguration, network issues, or blocked requests. Restarting your network, switching DNS servers, and flushing DNS cache usually fix the issue quickly.

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