Why Does ERR_NAME_NOT_RESOLVED Keep Breaking My Internet Connection?

What Causes ERR_NAME_NOT_RESOLVED to Ruin Your Browsing Experience?

When I see that dreaded ERR_NAME_NOT_RESOLVED message pop up in my browser, I know something went wrong with the internet’s address book system. Think of it like this: when you want to visit a website, your computer needs to find the right address. But sometimes, that address lookup fails completely.

This error happens when your device can’t translate a website name into the numbers computers actually use to connect. It’s like trying to call someone but your phone can’t find their number in the contacts list. The website might be working fine, but your computer just can’t figure out how to reach it.

The Real Reasons This Error Destroys Your Web Experience

I’ve seen this problem stem from several common issues that most people never think about:

Your Computer’s Memory Got Confused

Your device stores website addresses in a temporary memory called DNS cache. Sometimes this memory gets old information or wrong numbers. When that happens, your computer keeps trying to use bad addresses that don’t work anymore.

Your Internet Settings Point to Dead Servers

Every internet connection uses special servers that act like phone books for websites. If these servers go offline or get set up wrong, your computer can’t look up any addresses. This often happens when you change internet providers or get new equipment.

Security Software Blocks the Lookup

Some antivirus programs and firewalls think DNS requests look suspicious. They block these requests to protect you, but that also stops you from reaching perfectly safe websites.

The Website’s Address Changed Recently

Websites sometimes move to new addresses or update their settings. During this transition period, which can last up to two days, some computers still try to use the old address while others already switched to the new one.

Browser Problems Interfere

Your browser might have corrupted files, broken extensions, or privacy settings that block address lookups. Ad blockers and privacy tools sometimes accidentally block the very requests needed to find websites.

My Step-by-Step Fix Guide That Actually Works

I always start with the simplest solutions first. Here’s exactly what I do when this error appears:

Solution 1: Clear Your Computer’s Address Memory

This fixes about half of all cases I encounter:

For Windows:

1. Press Windows + R
2. Type cmd and press Ctrl + Shift + Enter
3. Type: ipconfig /flushdns
4. Press Enter

For Mac:

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

For Linux:

1. Open Terminal
2. Type: systemd-resolve –flush-caches

Solution 2: Switch to Better Address Servers

I recommend using these reliable public servers:

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

Change these in your network settings. On Windows, go to Network Adapter Settings. On Mac, use System Preferences > Network.

Solution 3: Restart Your Internet Equipment

This simple step refreshes everything:

1. Unplug your router and modem
2. Wait 30 seconds
3. Plug them back in
4. Wait for all lights to turn green

Solution 4: Test Your Connection Properly

Try visiting several different websites. If none work, the problem isn’t with DNS but with your internet connection itself. Connect directly with an ethernet cable to rule out Wi-Fi issues.

Solution 5: Clean Your Browser Completely

Chrome Users:

1. Go to Settings > Privacy and Security
2. Click “Clear browsing data“
3. Select “All time” and check all boxes

Firefox Users:

1. Go to Settings > Privacy & Security
2. Click “Clear Data“

Also disable all browser extensions temporarily, especially ad blockers and privacy tools.

Advanced Solutions for Stubborn Cases

When basic fixes don’t work, I try these more technical approaches:

Check the Website’s Status

Use a WHOIS lookup tool to verify the domain hasn’t expired. Expired domains simply can’t be reached by anyone.

Reset Your Network Stack (Windows)

Open Command Prompt as Administrator and run:

netsh winsock reset
netsh int ip reset

Restart your computer after both commands complete.

Temporarily Disable Security Software

Turn off Windows Defender or your antivirus for a few minutes to test. Remember to turn it back on immediately after testing.

Fix Your Hosts File

Sometimes manual edits to your computer’s hosts file cause problems:

Windows: Edit C:\Windows\System32\drivers\etc\hosts
Mac/Linux: Edit /etc/hosts

Remove any lines mentioning the problematic website.

Why Some Websites Cause More Problems

I’ve noticed certain situations make this error more likely:

Developer Domains

If you’re building websites locally, avoid using .dev domains unless you have proper HTTPS certificates. Google now requires HTTPS for all .dev addresses. Use .test or .localhost instead.

New Websites

Recently launched websites might take up to 48 hours to work everywhere. During this time, some people can access them while others can’t.

Corporate Networks

Office networks often have special rules that can interfere with DNS lookups. If you only see this error at work, contact your IT department.

Prevention Tips That Save Time

I follow these practices to avoid future problems:

• Flush DNS cache monthly on computers used for web development
• Keep router firmware updated
• Use reliable public DNS servers instead of ISP defaults
• Avoid manually editing hosts files unless absolutely necessary
• Update network drivers regularly

When to Seek Professional Help

Contact your internet provider if:

• Multiple devices show the same error
• The problem persists after trying all fixes
• Only specific websites consistently fail
• The error started after changing internet service

Most DNS errors resolve quickly with these methods. The key is working through solutions systematically rather than trying random fixes. Start simple, then move to more advanced solutions only if needed.