Server Not Institute - Troubleshoot connection problems

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If you take a problem connecting to a website, you may come across fault messages like Server Not Constitute. This article describes how to troubleshoot bug that cause this error.

  • For troubleshooting other error messages, see Error loading websites.

Table of Contents

  • 1 Try another browser
  • two No browsers can load websites
  • 3 Firefox cannot load websites simply other browsers can
    • 3.ane Cannot load websites after updating Firefox
    • 3.2 Firefox connection settings
    • 3.3 DNS Prefetching
    • iii.four IPv6
  • 4 Firefox cannot load certain websites
    • four.one Check for malware

Endeavor some other browser

To begin, endeavor 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 tin can load websites section.
  • If the other browsers tin 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 tin load websites, your problem is non in Firefox and so you should seek help elsewhere. Apple support includes these articles: Microsoft support includes these articles:

  • (Windows 10): Why tin't I go online? and Fix network connection bug in Windows 10
  • (Windows viii): Why can't I become connected?
  • (Windows 7): Why can't I get connected?
  • (Windows Vista): How to troubleshoot network connectivity problems in Internet Explorer
  • (Windows XP): How to troubleshoot home networking in Windows XP

You should as well check the following: You lot should brainstorm by checking the following:

  • Make certain your modem and/or router are both on and are not indicating errors.
  • If you are using a wireless connexion, brand certain that you are continued to the right admission signal.
  • Make 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, see the Configure firewalls so that Firefox can access the Internet article.
  • If you lot apply a proxy server, make sure that the proxy server can connect to the Cyberspace. For instructions on configuring proxy settings in Firefox, see Firefox connection settings below.

Firefox cannot load websites but other browsers tin

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

Cannot load websites after updating Firefox

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

In full general, y'all should remove Firefox from your program's list of trusted or recognized programs, then add it dorsum. For instructions on how to configure these programs, come across the Configure firewalls and so that Firefox can admission the Cyberspace article.

Firefox connection settings

If you connect to the Net through a proxy server that is having connection problems, you will not exist able to load websites. To cheque your connection settings in Firefox:

  1. In the Menu bar at the top of the screen, click and select . Click the carte du jour push Fx57Menu and select . Click the carte du jour button Fx89menuButton and select .

  2. Select the console.
  3. Curl downwardly 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 you connect through a proxy), select No Proxy.
    • If you connect to the Net through a proxy, compare Firefox'southward settings to another browser'southward (such every bit Net Explorer - see Microsoft's guide to proxy settings) (such equally Safari - see Safari for Mac: Set up a proxy server with Safari).
  5. Click OK to shut the Connection Settings window.
  6. Close the nearly:preferences page. Whatsoever changes you've made volition automatically be saved.

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

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

DNS Prefetching

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

  1. Type about:config in the address bar and press Enter Return .
    A alarm page may appear. Click Have the Risk and Continue to get to the nearly:config page.
  2. Right-click Concord down the control key while you click in the list of preferences, select , and then select .
  3. In the Enter the preference name field, enter network.dns.disablePrefetch and click OK.
  4. Select true when prompted to ready the value and click OK.

IPv6

Firefox supports IPv6 past default, which may cause connection bug on certain systems. To disable IPv6 in Firefox:

  1. Blazon well-nigh:config in the address bar and press Enter Render .
    A warning page may appear. Click Accept the Risk and Go on to go to the almost:config page.
  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 change its value from false to true .

Firefox cannot load certain websites

If you find that Firefox can load some websites but not others, kickoff clear your Firefox cookies and cache:

  1. Click on the menu button fx57menu Fx89menuButton to open the carte panel. Click the Library 57 library icon button on your toolbar. (If you don't see information technology, click the card fx57menu push button, then click click the bill of fare fx89menuButton button.)
  2. Click and select .
  3. In the Time Range to articulate: drop-down, select Everything.
  4. Below the drop-down menu, select both Cookies and Enshroud. Make sure other items you desire to keep are not selected.
  5. Click OK.

Check for malware

If immigration your cookies and enshroud did not enable yous to load the websites that did not piece of work in Firefox, you should check your computer for malware. Certain types of malware are known to target Firefox and can prevent it from loading various websites:

  • If y'all have an antivirus or Internet security plan, update its detections database and do a full scan of your system.
  • If you lot withal have bug, come across How practise 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 Republic of mali

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