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This article contains information on diagnosing and fixing error messages that display when you try to view websites in Firefox.

This article contains information on diagnosing and fixing error messages that display when you try to view websites in Firefox. __TOC__ = Connection errors = Error messages that indicate connection problems: * '''Unable to connect''' * '''Server not found''' If you experience one of these errors intermittently, check your Internet connection. If you connect wirelessly, make sure you are connected to the nearest access point and that the signal is strong. If you experience one of these errors on some or all websites, see the following articles: * [[Firefox cannot load websites but other programs can]] - if you can view websites in browsers other than Firefox. * [[No programs can load websites]] - if you can't view websites in any browser. * [[Cannot connect after upgrading Firefox]] - if you experience connection problems after updating Firefox. = Errors loading secure sites = If you experience an error accessing a website over a secure (HTTPS) connection, see the articles below that correspond to the error message you see: {for fx35} * [[This Connection Is Untrusted]] {/for} * [[Secure Connection Failed]] * [[Error code 500 accessing secure sites]] * [[Could not initialize the browser security component]] = Interrupted or reset connection = The following error can occur if the website you're visiting is experiencing problems: * '''The connection was interrupted''' * '''The connection was reset''' * '''The connection has timed out''' If you can visit the website in other browsers but not in Firefox: [[T:clearCookiesCache]] = Proxy errors = Error messages that indicate proxy problems: * '''The proxy server is refusing connections''' * '''Unable to find the proxy server''' This error indicates that Firefox is trying to access the Internet through a [http://en.wikipedia.org/wiki/Proxy_server proxy server]. To check your 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://support.microsoft.com/kb/135982 Microsoft's guide to proxy settings]){/for}{for mac}(Such as Safari. See [http://docs.info.apple.com/article.html?path=Safari/3.0/en/9299.html Apple's guide to proxy settings]){/for}. # Close the Connection Settings window. # [[T:closeOptionsPreferences]] = Malicious website errors = If you receive one of the following errors, Firefox has blocked access to the website you're visiting to protect you from [http://en.wikipedia.org/wiki/Malware malware] or [http://en.wikipedia.org/wiki/Phishing web forgery (phishing)]. * '''Suspected Attack Site!''' * '''Suspected Web Forgery!''' For more information, see [http://www.mozilla.com/en-US/firefox/phishing-protection/ Phishing and Malware Protection (Mozilla.com)]. = Other error messages = == The ... plugin has crashed == This means that a plugin which is being used to display content on the current page has unexpectedly quit. * See [[Plugin crash reports]] == Offline mode == {for fx35}Your operating system indicates to Firefox whether it is connected to the Internet. If it reports that it is not connected, Firefox will go into offline mode.{/for}{for not fx35}If you see a message about offline mode, you may have set Firefox not to use your network connection.{/for} Make sure your computer has a network connection and then: {for fx35} *{for win,linux}At the top of the Firefox window,{/for}{for mac}On the menu bar,{/for} click on the {menu File} menu and make sure that {menu Work Offline} is unchecked. {/for} {for not fx35} *{for linux}At the top of the Firefox window,{/for}{for mac}On the menu bar,{/for} {for linux,mac}click on the {menu File} menu and make sure that {menu Work Offline} is unchecked.{/for}{for win}Press the {key Alt} key to temporarily turn on the Menu Bar, click on the {menu File} menu (Windows XP, just click on the {menu File} menu) and make sure that {menu Work Offline} is unchecked. {/for} == The page isn't redirecting properly == This problem can be caused by problems with cookies: * See [[Websites say cookies are blocked]]. == File not found == <!--Reference: http://support.mozilla.com/tiki-view_forum_thread.php?locale=en-US&comments_parentId=435172&forumId=1--> If you experience this error when trying to access a local file (with a '''file://''' UR<!---->L), the path you are trying to access is either incorrect or inaccessible - verify the path. If you experience this error trying to access a website, see: * [[Troubleshooting extensions and themes]] * [[Is my Firefox problem a result of malware]] == Content Encoding Error == <!--Rogue firewall or incorrect proxy (sometimes from the firewall, sometimes from a web-accelerator) is a common cause. However, cookies/cache, extensions/themes/plugins, and corrupt preferences can cause it too.--> The following error messages indicate a content encoding problem: * '''Content Encoding Error''' * '''The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression''' Several problems can result in a content encoding error message. To diagnose and fix: # Check the settings of any Internet security applications you use (including firewalls, anti-virus or anti-spyware programs, and privacy protection programs). You should try to remove any permissions those applications have for Firefox, and then add them again. For program-specific instructions for a number of applications, see [[Firewalls]]. # Follow the [[Basic Troubleshooting#Standard troubleshooting steps|Standard troubleshooting steps]]. == This address is restricted == This error occurs when you are attempting to connect to a web server on a [http://en.wikipedia.org/wiki/Tcp_port port] that is reserved for another application. If the web address (URL) you are trying to visit contains a colon followed by a number (e.g. ''http://webserver.tld:23''), try removing that portion (e.g. ''http://webserver.tld'') or replacing it with '':80'' (e.g. ''http://webserver.tld:80'') If specifying a different port does not work, you may have been given an incorrect web address. <!-- Oops - can't load this page for some reason The address isn't valid Unsafe File Type The address wasn't understood - You might need to install other software to open this address Unexpected response from server --> = Other issues = * [[Warning Unresponsive script]] * [[Websites look wrong|The web page just doesn't look right]] {for win} * [[Firefox never finishes loading certain websites|Certain websites never finish loading]] {/for} * [[Cannot log in to websites]]. You may receive an error similar to ''We were unable to process your login request'' or ''An unspecified error has occurred'' when you attempt to sign into websites with your username and password, or the login may simply fail. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Error_loading_websites Error loading websites (mozillaZine KB)]'''''