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If you have a problem connecting to a website, you may see error messages like Server Not Establish. This article describes how to troubleshoot problems that cause this mistake.

For troubleshooting other mistake letters, run into Error loading websites.

Endeavor another browser

To begin, try 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 department.
If the other browsers tin can load the website, skip ahead to the Firefox cannot load websites but other browsers can department.

No browsers tin load websites

If neither Firefox nor your other browser can load websites, your problem is not in Firefox so y'all should seek help elsewhere. Apple support includes these manufactures: Microsoft support includes these articles:

(Windows ten): Why can't I get online? and Fix network connection issues in Windows ten
(Windows 8): Why tin can't I go connected?
(Windows 7): Why can't I go connected?
(Windows Vista): How to troubleshoot network connectivity bug in Internet Explorer
(Windows XP): How to troubleshoot home networking in Windows XP

Y'all should as well check the following: You lot should brainstorm past 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, make sure that you lot are continued to the right access bespeak.
Make sure your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is not blocking connections to the Cyberspace. For instructions on how to configure these programs, see the Configure firewalls so that Firefox tin access the Internet article.
If you lot use a proxy server, brand sure that the proxy server can connect to the Internet. For instructions on configuring proxy settings in Firefox, encounter Firefox connection settings beneath.

Firefox cannot load websites but other browsers can

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

Cannot load websites afterward 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 Internet admission fifty-fifty when they are in a "disabled" state.

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

Firefox connexion settings

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

In the Menu bar at the height of the screen, click and select . Click the menu button and select . Click the menu push button and select .
Select the panel.
Curl down to Network Proxy and click Settings....
Change your proxy settings:
- If you 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 Cyberspace through a proxy, compare Firefox'south settings to another browser's (such as Internet Explorer - come across Microsoft's guide to proxy settings) (such as Safari - run into Safari for Mac: Set up a proxy server with Safari).
Click OK to shut the Connectedness Settings window.
Close the about:preferences page. Any changes you've made will automatically be saved.

In the Menu bar at the top of the screen, click and select . Click the menu push and select . Click the carte button and select .
Select the panel.
Select the Network tab.
In the Connection section, click Settings....
Change your proxy settings:
- If you don't connect to the Internet through a proxy (or don't know whether you lot 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 equally Net Explorer - encounter Microsoft'south guide to proxy settings) (such as Safari - run into Safari for Mac: Set up a proxy server with Safari).
Click OK to close the Connexion Settings window.
Close the nigh:preferences page. Whatsoever changes you lot'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:

Blazon almost:config in the accost bar and press Enter Return .
A warning folio may announced. Click Accept the Risk and Continue to go to the nigh:config folio.
Right-click Hold downward the command key while you click in the list of preferences, select , and then select .
In the Enter the preference name field, enter network.dns.disablePrefetch and click OK.
Select true when prompted to set the value and click OK.

IPv6

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

Type nigh:config in the address bar and press Enter Return .
A warning page may appear. Click Accept the Risk and Go on to go to the about:config page.
In the Search field, enter network.dns.disableIPv6
In the list of preferences, double-click click the Toggle push button adjacent to network.dns.disableIPv6 to change its value from faux to true .

Firefox cannot load certain websites

If y'all find that Firefox can load some websites simply not others, first clear your Firefox cookies and cache:

Click on the carte button to open the carte console. Click the Library push on your toolbar. (If you don't run into it, click the card button, then click click the card button.)
Click and select .
In the Fourth dimension Range to clear: drop-downwards, select Everything.
Below the drop-down menu, select both Cookies and Cache. Make certain other items you want to go along are not selected.
Click OK.

Check for malware

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

If you have an antivirus or Net security program, update its detections database and do a full browse of your organization.
If you nevertheless have problems, see How do I go rid of malware?.

Thomas Ablared

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Server Not Establish - Troubleshoot connection problems

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