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. Neither Firefox nor any other program can control the firewall. If it could, that would completely defeat the purpose of the firewall.

A firewall will usually ask you whether to allow a program to connect to the Internet. In order for Firefox to work, you must grant access. If you deny access, you must reconfigure the firewall to allow access.

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.

Which firewall are you using?

• AVG Internet Security
• Avira Premium Security Suite (Avira Knowledge Base)
• BitDefender Internet Security
• CA Internet Security Suite
• Comodo Internet Security
• Comodo Firewall Pro
• F-Secure Internet Security
• Kaspersky Internet Security
• McAfee Internet Security
• Norton 360
• Norton Internet Security
• Online Armor Free
• Panda Internet Security
• Trend Micro Internet Security
• Windows Firewall
• ZoneAlarm Free Firewall

Find out which Firewalls are installed (Windows only)

Enum Process is an application that detects all firewalls. This is not created by Mozilla.

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.