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Fixed: "DNS Server Isn't Responding" Error

Published on April 19, 2026 • 8 min read

Networking hardware and fiber optic cables related to DNS

You open your browser, type in a website URL, and are instantly met with a blank screen stating: "This site can't be reached. DNS address could not be found" or "DNS Server Isn't Responding."

Your Wi-Fi is connected, your router lights are green, but you can't access any websites. This is one of the most common internet issues in the world. It happens because of an invisible technology called the Domain Name System (DNS).

To put it simply, DNS is the phonebook of the internet. When you type "Google.com", your computer asks a DNS server to translate that name into a numerical IP address (like 142.250.190.46). If the DNS server is down, your computer doesn't know what number to dial, resulting in a total internet blackout. Here is exactly how to fix DNS issues permanently.

Step 1: Flush Your Local DNS Cache

Your computer saves (caches) recent DNS translations to make web browsing faster. If a website changes its IP address, or the cache becomes corrupted, your computer will keep trying to dial the "wrong number," causing localized DNS issues.

For Windows:

  1. Click Start, type cmd, and hit Enter.
  2. Type ipconfig /flushdns and press Enter. You should see a success message.

For Mac:

  1. Open the Terminal app (found in Applications > Utilities).
  2. Type sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder and hit Enter. (You will need to enter your Mac password).

Step 2: Change Your DNS Servers Manually

By default, your router uses the DNS servers provided by your Internet Service Provider (ISP). Unfortunately, ISP DNS servers are notoriously slow and prone to crashing. The ultimate fix for recurring DNS issues is to manually tell your computer to use public, reliable DNS servers operated by Google or Cloudflare.

How to Change DNS on Windows 11/10:

  1. Press the Windows Key + R, type ncpa.cpl, and press Enter.
  2. Right-click your active Wi-Fi or Ethernet connection and select Properties.
  3. Select Internet Protocol Version 4 (TCP/IPv4) and click Properties.
  4. Select the bubble that says "Use the following DNS server addresses:"
  5. For the Preferred DNS server, enter 8.8.8.8 (Google's Public DNS).
  6. For the Alternate DNS server, enter 8.8.4.4.
  7. Click OK and close the windows. Your DNS issues should immediately vanish.

Alternative: If you prefer Cloudflare's faster, privacy-focused DNS, you can use 1.1.1.1 as the preferred server and 1.0.0.1 as the alternate.

Step 3: Power Cycle the Router

If you have manually set your DNS servers to Google, but multiple devices in your home are still experiencing massive DNS issues, the problem lies within your router's firmware cache. The routing table itself has frozen.

  • Walk over to your physical router and modem.
  • Unplug the power cable from the back of both devices.
  • Wait a full 60 seconds to allow the capacitors to drain completely.
  • Plug them back in. Wait exactly 5 minutes for the upstream channel to lock in before testing your connection again.

Are network outages slowing you down?

If changing your DNS server addresses didn't permanently resolve your browser timeouts, your hardware connection may be experiencing severe jitter or packet loss. Run our instant, browser-based diagnostic check to see exactly where your signal is dropping.

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