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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. 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. This article will help you find information about configuring your firewall to work with Firefox.

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}'''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.'''{/note} = Which firewall are you using? = * [[Configuring AVG Internet Security|AVG Internet Security]] * [http://www.avira.com/en/support-for-home-knowledgebase-detail/kbid/567 Avira Premium Security Suite (Avira Knowledge Base)] * [[Configuring BitDefender Internet Security|BitDefender Internet Security]] * [[Configuring CA Internet Security Suite|CA Internet Security Suite]] * [[Configuring Comodo Internet Security|Comodo Internet Security]] * [[Configuring Comodo Firewall Pro|Comodo Firewall Pro]] * [[Configuring F-Secure Internet Security|F-Secure Internet Security]] * [[Configuring Kaspersky Internet Security|Kaspersky Internet Security]] * [[Configuring McAfee Internet Security|McAfee Internet Security 2009 or 2010]] * [[Configuring McAfee Security Center|McAfee Security Center]] (McAfee Total Protection, McAfee AntiVirus, or McAfee Internet Security 2011) * [[Configuring Norton 360|Norton 360]] * [[Configuring Norton Internet Security|Norton Internet Security]] * [[Configuring Online Armor Free|Online Armor Free]] * [[Configuring Panda Internet Security|Panda Internet Security]] * [[Configuring Trend Micro Internet Security|Trend Micro Internet Security]] * [[Configuring Windows Firewall|Windows Firewall]] * [[Configuring ZoneAlarm Free Firewall|ZoneAlarm Free Firewall]] <!-- When adding a firewall, remember to add it to https://support.mozilla.com/kb/Cannot+connect+after+upgrading+Firefox as well. --> = Find out which Firewalls are installed (Windows only) = '''Enum Process''' is an application that detects all firewalls. ''This is not created by Mozilla.'' # Download [http://www.trolly.homepage.t-online.de/EnumProcess.exe Enum Process]. # After downloading, double-click {filepath EnumProcess.exe}. # Select {button Run}. # In the drop-down menu to the right, select '''Simple'''.<br/> <br/>[[Image:simple_enumprocess.PNG]]<br/> # Click {button List Processes}.<br/> <br/>[[Image:listprocesses_enumprocess.PNG]]<br/>