How to Solve the “Server Not Found” Error on Firefox Browser

A common problem is the error message “Server not found – Firefox can’t find the server” in Firefox. Many users report encountering this error when trying to load a website with Firefox, even though the website can be opened in other browsers without any problems. If you encounter the same problem, read this article to find a solution.

What causes the “Server not found” error in Firefox?

Weak Internet connection: Another reason that can cause the “Server not found” error can be a weak or unstable Internet connection. A good quality Internet connection is necessary to establish a reliable and stable connection.

A technical fault on the server-side: The main reason for this error may be a technical fault on the server-side that prevents the user to establish a connection between the browser and the website, causing the browser to display a “Server not found” error.

Blocked Site: The user may be attempting to access a site that has been blocked by the local government for security or privacy reasons. Attempting to access a blocked site may cause an error and the user will see a “Server not found” error instead of the site’s home page.

How to repair the “Server not found” error message in Firefox?


Restarting the router/modem

  1. Press the power button on your modem/router to turn it off.
  2. Wait 30 seconds.
  3. Press the power button again to turn the modem/router back on.
  4. Wait for the machine to boot up.

Check your Firefox proxy settings

  1. Select the menu button and choose Settings.
  2. Go to the Advanced section.
  3. Now select the Network tab.
  4. Go to Connections and select Settings.
  5. If you’re not using a proxy server, select No Proxy.
  6. If you are connecting through a proxy server, check your proxy settings against your other browser.
  7. Then click OK. Any changes you have made are automatically saved.

Deactivate the DNS Prefix

  1. Type about: config in the Firefox URL bar, then press Return.
  2. You might get the following warning: This could void your warranty! Ignore the message and click I accept the risk!
  3. While browsing through the list of settings, hold down the Ctrl key and select New, then Boolean.
  4. In the Enter Parameter Name window, select network.DNS.disablePrefetch and click OK.
  5. When prompted to set the value, select True and click OK.

Disable IPv6

  1. In the Firefox URL, type about: config and press Return.
  2. The following warning may appear: This may void your warranty! Ignore the message and click I accept the risk!
  3. Type network.dns.disableIPv6 in the search box.
  4. In the options list, select network.DNS.disableIPv6 and change the value from false to true.

Frequently Asked Questions

Configure your Windows firewall so that Firefox can access the Internet. The "Server not found" error message may be because the Windows firewall prevents Firefox from accessing the Internet. Learn how to configure your firewall so that Firefox can access the Internet.

  1. Check your Internet connection.
  2. Check the website address.
  3. Try a different website.
  4. Try a different Web browser.
  5. Check your firewall and antivirus settings.
  6. Check for malware and malicious browser extensions.
  7. Don't use a proxy server.

Firefox connection problems can be caused by general network or internet problems. Check your modem and/or router to make sure it is connected to the network and Internet. Unplug the router and modem from the network for at least 30 seconds to reboot them both, and check the connection after a full reboot.

  1. Click on Firefox in the menu bar at the top of the screen and select Settings.
  2. Under General, go to Proxy Network Settings.
  3. Under Proxy Network Settings, click on Settings.
  4. Change the proxy settings.
  5. Close the Connection Settings dialog box.

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