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Configure firewalls so that Firefox can access the Internet

A personal firewall is a security program that oversees all of your computer's connections to the Internet. It may be included as part of an Internet security suite, or it may be a free-standing program. Most personal firewalls will deny Internet access to any program, or a new version of any program, unless you have specifically allowed access. This article will help you find information about configuring your firewall to work with Firefox.

Note: In some cases, disabling an Internet security program or firewall does not stop all of its parts from being active. A program that reports that it is disabled may still be able to block Firefox.

Find out which firewall is installed

If you know which firewall or Internet security suite you are running, skip to the next section.

Depending on your Windows version, do the following:

  • Windows 10: Find it in Windows Control Panel, Security and Maintenance under the Security section.
  • Windows 7/8: Find it under the Security section in Windows Action Center. For more information, see What is Action Center? at
  • Windows XP SP2 and SP3/Vista: Find it under the Firewall section in Windows Security Center. For more information, see Using Windows Security Center at

If you can't still detect your firewall with the above steps, try to run Enum Process (not created by Mozilla) that is an application that detects many common firewalls:

  1. Download Enum Process.
  2. After downloading, double-click EnumProcess.exe.
  3. Select Run.
  4. In the drop-down menu to the right, select Simple.

  5. Click List Processes.


Configuring firewalls

Refer to the Apple documentation.

Go to your distribution's firewall documentation.

Customize this article


Firefox for Android

Firefox for iOS

Firefox OS


Version History
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in the list of firewalls I find a lot, but not how to handle the firewall of "GData Internet Security". That is a commercial product (Windows only) which outperforms all others concerning protection level. It would be great if someone with enough knowledge could point out how to configure it so that it doesn't interfere with firefox. Thanks!


Hi cjws,

Sorry for the late answer, but there was no way to monitor these article discussion forums until recently.

In the firewall article list, most are now no longer maintained, only the most viewed ones are still updated, that is Configure Windows Firewall to allow Firefox access to the Internet (458 hits the last week), Configure Norton 360 to work with Firefox (242 hits the last week), Update McAfee Security Center and firewall settings to allow Firefox access to the Internet (143 hits the last week).

So I reject your request to add GData Internet Security unless there is a KB link such as the one for Avira:, which I don't find in

A question came up in the Update McAfee Security Center and firewall settings to allow Firefox access to the Internet article discussion forum on whether to archive that article, since it appears to be outdated.

This article links to it, under "Configuring firewalls". I suggested finding a McAfee document to link to instead, since this article already links to external sources for Avira and Trend Micro firewall configuration.

This is copied from that discussion, /en-US/kb/update-mcafee-and-firewall-.../5974

Marko said

Is this article OK? Make a redirect?

AliceWyman said

That mcafee article looks fine but we shouldn't try to redirect this article there (if that's even possible). If we decide that this article should be archived (hopefully Joni or others will weigh in) then we should change the McAfee link in the Configure firewalls so that Firefox can access the Internet article, so that it goes to McAfee's document.

The McAfee link has been changed, to link to (Thanks, Joni)

I create a new revision that is pending review, add Windows XP SP2 also, since we support XP SP2 not only XP SP3.

I'm not sure but maybe the Windows Firewall information in this article and the linked Using Windows Security Center Microsoft article only applies to Windows XP SP3?

I found these Microsoft articles:

Windows Firewall blocks some programs after you install Windows XP SP3

How to configure the Windows Firewall feature in Windows XP Service Pack 2

We should also update this article for Windows 10. I'll set up a "Needs change" entry.

I'll approve your revision since I found this article about the Windows Security Center in Windows XP Sp2. Windows XP Service Pack 2 (Part 3): The new Security Center

We should add Windows 10 information. I don't have win10 but I found the following: (Quote) In Windows 10, the new action center is where you'll find app notifications and quick actions. But the old action center is still here—it's been renamed Security and Maintenance. And it's still where you go to change your security settings. Quote:

In Windows 10 the Action Center has been renamed to Security and Maintenance. Despite the change of name, the functionality has not changed from the functionality of the Action Center in Windows 8.