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This article describes problems where Firefox cannot load websites, but other web browsers can. When this happens, Firefox may show a Server not found or Unable to connect error message.

This article describes problems where Firefox cannot load websites, but other web browsers (such as {for win}Internet Explorer{/for}{for mac}Safari{/for}{for linux}Epiphany on Gnome or Konqueror on KDE{/for}) can. When this happens, Firefox may show a '''Server not found''' or '''Unable to connect''' error message. * For other error messages that display when you try to view websites in Firefox, see [[Error loading web sites]]. * If none of the web browsers on your computer can load websites, see [[No programs can load websites]]. __TOC__ = Internet Security software blocking Firefox = If you were able to load websites until you updated Firefox or until your Internet security software was updated, reconfigured or a new one was added, your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is likely preventing Firefox from connecting to the Internet. {note}'''Note:''' Some Internet security programs can block Internet access even when they are in a "disabled" state.{/note} In general, you should make sure your Internet security software is up-to-date and remove Firefox from your program's list of trusted or recognized programs, then add it back. For instructions on how to configure some programs, see the [[Firewalls]] article. = Firefox connection settings = If you connect to the Internet through a proxy server that is having connection problems, you will not be able to load websites. To check your Firefox proxy settings: # [[T:optionspreferences]] # Select the {menu Advanced} panel. # Select the '''Network''' tab. # In the Connection section, click {button Settings...}. # 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 you connect to the Internet through a proxy, compare Firefox's settings to another browser's {for win}(such as Internet Explorer — see [http://windows.microsoft.com/en-US/windows7/Change-proxy-server-settings-in-Internet-Explorer Microsoft's guide to proxy settings]){/for}{for mac}(such as Safari — see [http://docs.info.apple.com/article.html?path=Safari/5.0/en/9299.html Apple's guide to proxy settings]){/for}. # Close the Connection Settings window. # [[T:closeOptionsPreferences]] If you find that changes you make to your Firefox connection settings are not remembered when you restart Firefox, see [[Preferences are not saved]]. = IPv6 = Firefox supports [http://en.wikipedia.org/wiki/IPv6 IPv6] by default, which may cause connection problems on certain systems. To disable IPv6 in Firefox: # [[T:aboutconfig]] # In the '''{for not fx11}Filter{/for}{for fx11}Search{/for}''' field, type {pref network.dns.disableIPv6}. # In the list of preferences, double-click {pref network.dns.disableIPv6} to set its value to '''{pref true}'''. = DNS Prefetching = Firefox attempts to speed up loading new websites by using [https://developer.mozilla.org/En/Controlling_DNS_prefetching DNS Prefetching], which can cause page load errors with some system configurations. To disable DNS Prefetching: # [[T:aboutconfig]] # [[T:contextmenu]] in the list of preferences, select {menu New}, and then select {menu Boolean}. # In the '''Enter the preference name''' window, enter {pref network.dns.disablePrefetch} and click {button OK}. # Select {pref true} when prompted to set the value and click {button OK}. = Firefox cannot load certain websites = If you find that Firefox can load some websites but not others, {for win}first{/for} clear your Firefox cookies and cache: [[T:clearCookiesCache]] == Check for malware == If clearing your cookies and cache did not enable you to load the websites that did not work in Firefox, you should check your computer for [http://en.wikipedia.org/wiki/Malware malware]. Certain types of malware are known to target Firefox and can prevent 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 system. * If you still have problems, follow the instructions in [[Is my Firefox problem a result of malware]]. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Error_loading_websites Error loading websites (mozillaZine KB)]''''' [[Template:ShareArticle|link=http://mzl.la/MpYRMj]]