What Causes DNS Server Unavailable?


Scott Campbell

What Causes DNS Server Unavailable?

When it comes to browsing the internet, a key component that ensures smooth connectivity is the Domain Name System (DNS). This system translates domain names, such as www.example.com, into IP addresses that computers can understand.

However, there are instances when you may encounter a “DNS Server Unavailable” error, preventing you from accessing websites. Let’s explore some common causes behind this issue and how to resolve them.

1. Internet Connection Issues

Your internet connection plays a vital role in accessing DNS servers. If you’re experiencing connectivity problems, it can lead to DNS server unavailability. To troubleshoot this issue:

  • Check your router and modem: Ensure that all cables are properly connected and that your devices are powered on.
  • Restart your router: Sometimes, a simple restart can fix temporary glitches in the network.
  • Contact your Internet Service Provider (ISP): If the problem persists, reach out to your ISP for assistance with resolving any connection-related issues.

2. Incorrect DNS Settings

If your computer or device is configured with incorrect DNS settings, it can result in server unavailability. To rectify this:

  • Reset DNS settings: Go to your network settings and reset the DNS configurations to default or obtain them automatically.
  • Use alternate DNS servers: You can try using public DNS servers like Google Public DNS (8.8.8 and 8.4.4) or OpenDNS ( and 208.220.220).

3. Firewall or Antivirus Interference

In some cases, your firewall or antivirus software may interfere with DNS server connectivity. To troubleshoot this:

  • Temporarily disable your firewall: Disable your firewall temporarily and check if the DNS server becomes available.
  • Review antivirus settings: Ensure that your antivirus software is not blocking DNS connections. Adjust settings if necessary.

4. DNS Server Outage

Sometimes, the unavailability of a DNS server is due to an outage on the server’s end. This can occur due to maintenance, technical issues, or heavy traffic. Unfortunately, there is not much you can do in such situations except wait for the service to be restored.

5. Router Configuration Issues

If your router is not configured correctly, it can lead to DNS server unavailability. To resolve this:

  • Reset your router: Resetting your router to its default settings can help eliminate any misconfigurations.
  • Edit router settings: Check your router’s configuration page and ensure that the DNS settings are correct.

In conclusion, a “DNS Server Unavailable” error can occur due to various reasons such as internet connection issues, incorrect DNS settings, firewall or antivirus interference, DNS server outages, or router configuration problems. By following the troubleshooting steps outlined above, you should be able to resolve the issue and regain access to websites swiftly.

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