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How to Fix DNS_PROBE_FINISHED_NXDOMAIN Error in Your Local Network

By Rodolfo Castro Lab Verified Read time: 5 min Updated: 2026-06-25
✨ Quick Answer

The error DNS_PROBE_FINISHED_NXDOMAIN (Non-Existent Domain) signifies that the Domain Name System resolver could not translate the requested hostname into a valid IP address. This typically arises from corrupted local DNS cache entries, outdated hostfile overrides, or upstream nameserver lookup failures.

Quick Diagnostics

Cause
Stale or corrupted DNS resolver cache in operating system or web browser
Solution
Flush DNS cache via ipconfig /flushdns on Windows or resolvectl flush-caches on Linux
Cause
ISP default DNS resolvers offline or failing hostname translation lookups
Solution
Switch primary nameservers to Cloudflare (1.1.1.1) or Google (8.8.8.8)

The error DNS_PROBE_FINISHED_NXDOMAIN (Non-Existent Domain) signifies that the Domain Name System resolver could not translate the requested hostname into a valid IP address. This typically arises from corrupted local DNS cache entries, outdated hostfile overrides, or upstream nameserver lookup failures.

Step-by-Step Solution

Step 1: Flush Operating System DNS Cache

Purge stale IP records from local memory:

BASH 
# On Windows (Admin Command Prompt):
ipconfig /flushdns

# On Linux (systemd-resolved):
sudo resolvectl flush-caches

# On macOS:
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

Step 2: Clear Internal Browser Host Cache

Chromium-based browsers maintain independent DNS lookup caches:

  1. 1

    Step 1

    Open your browser and navigate to chrome://net-internals/#dns.
  2. 2

    Step 2

    Click Clear host cache.
  3. 3

    Step 3

    Navigate to chrome://net-internals/#sockets and click Flush socket pools.

Step 3: Switch to Reliable Public DNS Resolvers

Replace unresponsive ISP nameservers with high-performance Anycast resolvers:

  • Cloudflare DNS: Primary 1.1.1.1 | Secondary 1.0.0.1
  • Google Public DNS: Primary 8.8.8.8 | Secondary 8.8.4.4

On Linux, apply in /etc/systemd/resolved.conf:

INI 
[Resolve]
DNS=1.1.1.1 8.8.8.8
FallbackDNS=1.0.0.1 8.8.4.4

Restart daemon: sudo systemctl restart systemd-resolved.

Step 4: Verify Local Hosts File Integrity

Ensure no stale testing records are hardcoded inside:

  • Windows: C:\Windows\System32\drivers\etc\hosts
  • Linux / macOS: /etc/hosts

❓ Frequently Asked Questions (FAQ)

What does NXDOMAIN stand for?

NXDOMAIN stands for Non-Existent Domain, an RFC-standard response from authoritative nameservers indicating the requested host has no registered IP records.

Can rebooting my router fix NXDOMAIN?

Yes. Residential routers cache local DNS responses. A power cycle clears corrupt gateway lookup tables.

Prevention Advice

Recommended security practices:

  • Enable DNS over HTTPS (DoH): Protect DNS lookups against ISP transparent caching and DNS hijacking by enabling secure DNS in browser settings.
  • Audit domain propagation: If you manage the domain, use tools like whatsmydns.net to verify authoritative A/CNAME record distribution.
Author • Web Designer & App Creator

Rodolfo Castro

Web designer, app developer, and founder of SoporteCero. Specializing in UI/UX architecture, digital products, and modern web environments. Every tutorial and guide on SoporteCero is thoroughly tested and verified in our technical lab to ensure reliable, up-to-date solutions.

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