為了改善您的使用體驗,本網站正在進行維護,部分功能暫時無法使用。若本站的文件無法解決您的問題,想要向社群發問的話,請到 Twitter 上的 @FirefoxSupport 或 Reddit 上的 /r/firefox 發問,我們的社群成員將很快會回覆您的疑問。

搜尋 Mozilla 技術支援網站

防止技術支援詐騙。我們絕對不會要求您撥打電話或發送簡訊,或是提供個人資訊。請用「回報濫用」功能回報可疑的行為。

了解更多

Firefox is "unable to connect" to any site, while other broswers can

  • 3 回覆
  • 5 有這個問題
  • 1 次檢視
  • 最近回覆由 vtand06

more options

I've tried clearing my cookies and history, disabling addons/extensions and the firewall, changing/disabling proxy settings, and read several of the articles, but nothing seems to work. I was out of town for 2 days and everything was working fine when I left. Got back today and just kept getting "unable to connect" message for any website I tried to open. I tried to download chrome and opera, but the download had an error and just didn't work (chrome) and just stayed at 0% with nothing happening (opera). i'm able to get emails and get on websites via internet explorer.

I've tried clearing my cookies and history, disabling addons/extensions and the firewall, changing/disabling proxy settings, and read several of the articles, but nothing seems to work. I was out of town for 2 days and everything was working fine when I left. Got back today and just kept getting "unable to connect" message for any website I tried to open. I tried to download chrome and opera, but the download had an error and just didn't work (chrome) and just stayed at 0% with nothing happening (opera). i'm able to get emails and get on websites via internet explorer.

由 vtand06 於 修改

所有回覆 (3)

more options

Hello vtand06, did you also try a Clean reinstall ? This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:

Note: You might want to print these steps or view them in another browser.

  1. Download the latest Desktop version of Firefox from mozilla.org (or choose the download for your operating system and language from this page) and save the setup file to your computer.
  2. After the download finishes, close all Firefox windows (or open the Firefox menu New Fx Menu and click the close button Close 29).
  3. Delete the Firefox installation folder, which is located in one of these locations, by default:
    • Windows:
      • C:\Program Files\Mozilla Firefox
      • C:\Program Files (x86)\Mozilla Firefox
    • Mac: Delete Firefox from the Applications folder.
    • Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
  4. Now, go ahead and reinstall Firefox:
    1. Double-click the downloaded installation file and go through the steps of the installation wizard.
    2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

More information about reinstalling Firefox can be found here.

WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See Back up and restore information in Firefox profiles.

Please report back to say if this helped you!

Thank you.

more options

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test.


Do a malware check with several malware scanning programs on the Windows computer. Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also:

more options

ideato - I tried to download the installer for firefox, but it wouldn't let me download it, just said that there was no internet connection. however, I was able to get on multiple websites with no issues. Ill try and download onto another computer just copy the file over and try your suggestion.