Server Not Found - Troubleshoot connectedness problems

If yous have a trouble connecting to a website, y'all may see error messages like Server Non Institute. This article describes how to troubleshoot problems that cause this error.

  • For troubleshooting other mistake messages, encounter Error loading websites.

Table of Contents

  • 1 Try some other browser
  • two No browsers can load websites
  • 3 Firefox cannot load websites just other browsers can
    • three.ane Cannot load websites after updating Firefox
    • iii.two Firefox connection settings
    • 3.three DNS Prefetching
    • 3.4 IPv6
  • 4 Firefox cannot load certain websites
    • four.1 Bank check for malware

Try some other browser

To brainstorm, endeavour opening a website in another browser (such as Internet Explorer Safari Epiphany or Chromium).

  • If all other browsers cannot load the website, move on to the No browsers can load websites section.
  • If the other browsers can load the website, skip ahead to the Firefox cannot load websites but other browsers can section.

No browsers can load websites

If neither Firefox nor your other browser can load websites, your problem is non in Firefox and so y'all should seek help elsewhere. Apple back up includes these articles: Microsoft back up includes these articles:

  • (Windows x): Why can't I become online? and Set up network connection issues in Windows ten
  • (Windows 8): Why can't I get connected?
  • (Windows vii): Why can't I get connected?
  • (Windows Vista): How to troubleshoot network connectivity problems in Internet Explorer
  • (Windows XP): How to troubleshoot abode networking in Windows XP

Yous should also check the following: Y'all should begin by checking the following:

  • Make certain your modem and/or router are both on and are non indicating errors.
  • If you are using a wireless connexion, make sure that you lot are connected to the right access point.
  • Brand sure your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is non blocking connections to the Internet. For instructions on how to configure these programs, run across the Configure firewalls so that Firefox can access the Net article.
  • If you utilize a proxy server, make sure that the proxy server tin can connect to the Internet. For instructions on configuring proxy settings in Firefox, see Firefox connection settings below.

Firefox cannot load websites but other browsers can

If Firefox cannot load websites, simply your other browser tin can, follow the instructions below.

Cannot load websites afterwards updating Firefox

If you were able to load websites until yous updated Firefox, your Net security software (including firewalls, antivirus programs, anti-spyware programs, and more) is probable preventing Firefox from connecting to the Internet. Some Internet security programs can cake Net access even when they are in a "disabled" country.

In general, you should remove Firefox from your program'due south list of trusted or recognized programs, and then add information technology dorsum. For instructions on how to configure these programs, run into the Configure firewalls then that Firefox can access the Internet article.

Firefox connection settings

If y'all connect to the Net through a proxy server that is having connexion problems, you volition not be able to load websites. To check your connection settings in Firefox:

  1. In the Menu bar at the meridian of the screen, click and select . Click the carte button Fx57Menu and select . Click the menu button Fx89menuButton and select .

  2. Select the panel.
  3. Scroll down to Network Proxy and click Settings....
  4. Change your proxy settings:
    • If you lot don't connect to the Internet through a proxy (or don't know whether yous connect through a proxy), select No Proxy.
    • If you connect to the Net through a proxy, compare Firefox's settings to some other browser's (such as Internet Explorer - run into Microsoft'due south guide to proxy settings) (such as Safari - see Safari for Mac: Fix up a proxy server with Safari).
  5. Click OK to close the Connectedness Settings window.
  6. Close the about:preferences folio. Any changes yous've made volition automatically be saved.

  1. In the Menu bar at the peak of the screen, click and select . Click the menu button Fx57Menu and select . Click the bill of fare button Fx89menuButton and select .

  2. Select the panel.
  3. Select the Network tab.
  4. In the Connection section, click Settings....
  5. Change your proxy settings:
    • If you don't connect to the Internet through a proxy (or don't know whether you connect through a proxy), select No Proxy.
    • If y'all connect to the Internet through a proxy, compare Firefox's settings to some other browser'due south (such every bit Cyberspace Explorer - see Microsoft'south guide to proxy settings) (such equally Safari - run across Safari for Mac: Set upwards a proxy server with Safari).
  6. Click OK to shut the Connection Settings window.
  7. Close the about:preferences page. Any changes you've made will automatically exist saved.

DNS Prefetching

DNS Prefetching is a technique Firefox uses to speed upwards loading new websites. To disable DNS Prefetching:

  1. Type well-nigh:config in the address bar and printing Enter Render .
    A alert folio may appear. Click Take the Risk and Continue to go to the nearly:config page.
  2. Right-click Hold down the control key while you click in the list of preferences, select , and and so select .
  3. In the Enter the preference name field, enter network.dns.disablePrefetch and click OK.
  4. Select true when prompted to set the value and click OK.

IPv6

Firefox supports IPv6 by default, which may cause connectedness problems on certain systems. To disable IPv6 in Firefox:

  1. Type most:config in the accost bar and press Enter Return .
    A alert folio may appear. Click Accept the Take chances and Continue to get to the about:config folio.
  2. In the Search field, enter network.dns.disableIPv6
  3. In the list of preferences, double-click click the Toggle Fx71aboutconfig-ToggleButton button next to network.dns.disableIPv6 to alter its value from imitation to true .

Firefox cannot load sure websites

If yous notice that Firefox can load some websites but not others, first articulate your Firefox cookies and enshroud:

  1. Click on the menu button fx57menu Fx89menuButton to open up the carte du jour panel. Click the Library 57 library icon button on your toolbar. (If you don't see it, click the menu fx57menu button, then click click the menu fx89menuButton button.)
  2. Click and select .
  3. In the Fourth dimension Range to clear: drop-down, select Everything.
  4. Below the drop-downwards card, select both Cookies and Cache. Brand sure other items y'all want to keep are not selected.
  5. Click OK.

Check for malware

If immigration your cookies and cache did non enable you to load the websites that did non piece of work in Firefox, yous should check your figurer for malware. Certain types of malware are known to target Firefox and can prevent information technology from loading various websites:

  • If you accept an antivirus or Internet security programme, update its detections database and practise a full scan of your arrangement.
  • If you still have problems, see How do I get rid of malware?.

These fine people helped write this article:

AliceWyman, Underpass, novica, Tonnes, COKEDUDE, Michael Verdi, scoobidiver, Swarnava Sengupta, Joergen, ideato, user669794, Wesley Branton, Hossain Al Ikram, scootergrisen, Joni, Sanket Kumar Mali

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