If you have a trouble connecting to a website, you may see error messages like Server Not Found. This commodity describes how to troubleshoot issues that cause this error.

For troubleshooting other error letters, encounter Error loading websites.

ane Try another browser
2 No browsers can load websites
iii Firefox cannot load websites but other browsers can
- three.1 Cannot load websites after updating Firefox
- 3.2 Firefox connectedness settings
- 3.three DNS Prefetching
- 3.iv IPv6
iv Firefox cannot load sure websites
- iv.one Bank check for malware

Try another browser

To begin, try opening a website in another browser (such equally Cyberspace Explorer Safari Epiphany or Chromium).

If all other browsers cannot load the website, move on to the No browsers tin 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 not in Firefox then you should seek assist elsewhere. Apple support includes these articles: Microsoft support includes these articles:

(Windows x): Why can't I go online? and Ready network connexion bug in Windows ten
(Windows 8): Why can't I get connected?
(Windows 7): Why can't I get connected?
(Windows Vista): How to troubleshoot network connectivity problems in Cyberspace Explorer
(Windows XP): How to troubleshoot abode networking in Windows XP

You should also check the post-obit: Yous should begin by checking the following:

Make sure your modem and/or router are both on and are not indicating errors.
If you are using a wireless connection, brand sure that you are connected to the right admission indicate.
Make sure your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is not blocking connections to the Net. For instructions on how to configure these programs, see the Configure firewalls so that Firefox tin access the Internet article.
If you use a proxy server, make sure that the proxy server can connect to the Net. For instructions on configuring proxy settings in Firefox, see Firefox connection settings below.

Firefox cannot load websites but other browsers tin can

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

Cannot load websites after updating Firefox

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

In general, you should remove Firefox from your program'south list of trusted or recognized programs, then add together it back. For instructions on how to configure these programs, encounter the Configure firewalls so that Firefox tin can admission the Cyberspace article.

Firefox connection settings

If you connect to the Internet through a proxy server that is having connexion bug, yous will not be able to load websites. To check your connection settings in Firefox:

In the Menu bar at the elevation of the screen, click and select . Click the menu button and select . Click the carte button and select .
Select the panel.
Scroll down to Network Proxy and click Settings....
Change your proxy settings:
- If you don't connect to the Cyberspace through a proxy (or don't know whether you connect through a proxy), select No Proxy.
- If yous connect to the Internet through a proxy, compare Firefox'south settings to another browser's (such every bit Internet Explorer - run across Microsoft'south guide to proxy settings) (such as Safari - see Safari for Mac: Fix a proxy server with Safari).
Click OK to close the Connection Settings window.
Close the almost:preferences page. Any changes yous've made volition automatically be saved.

In the Menu bar at the top of the screen, click and select . Click the menu push button and select . Click the menu push and select .
Select the panel.
Select the Network tab.
In the Connectedness department, click Settings....
Alter your proxy settings:
- If y'all 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 Internet through a proxy, compare Firefox'south settings to another browser's (such equally Internet Explorer - come across Microsoft'due south guide to proxy settings) (such as Safari - come across Safari for Mac: Set up a proxy server with Safari).
Click OK to close the Connectedness Settings window.
Close the about:preferences folio. Any changes you've fabricated will automatically exist saved.

DNS Prefetching

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

Type about:config in the accost bar and press Enter Return .
A warning page may appear. Click Have the Run a risk and Continue to go to the about:config page.
Correct-click Concur down the command key while y'all click in the list of preferences, select , and and so select .
In the Enter the preference proper noun field, enter network.dns.disablePrefetch and click OK.
Select truthful when prompted to set the value and click OK.

IPv6

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

Type nearly:config in the address bar and printing Enter Return .
A warning page may appear. Click Take the Risk and Continue to go to the about:config folio.
In the Search field, enter network.dns.disableIPv6
In the list of preferences, double-click click the Toggle push next to network.dns.disableIPv6 to modify its value from false to true .

Firefox cannot load certain websites

If y'all discover that Firefox tin can load some websites just non others, first articulate your Firefox cookies and cache:

Click on the carte button to open up the card panel. Click the Library push on your toolbar. (If you don't see information technology, click the carte button, then click click the card button.)
Click and select .
In the Time Range to clear: drop-downwards, select Everything.
Beneath the drib-downward menu, select both Cookies and Cache. Make sure other items you desire to go on are not selected.
Click OK.

Check for malware

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

If you have an antivirus or Internet security program, update its detections database and do a full scan of your organisation.
If you nonetheless have issues, meet How do I get rid of malware?.

Brigden Norome

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Server Not Found - Troubleshoot connection problems

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