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Unblock Firefox from connecting to the Internet

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If you have a problem connecting to a website, you may see error messages like Server Not Found. This article describes how to troubleshoot problems that cause this error. For troubleshooting other error messages, see Error loading websites. Table of Contents1 Try another browser2
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Windows provides a built-in firewall, which controls how programs access the Internet. If Windows Firewall doesn't permit Firefox to make connections, Firefox generates a "Server not found" error when you try to browse to websites. Note: This article only applies to Windows.
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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. Most personal firewalls will deny Internet access to any program, or a new
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This article applies to users with McAfee 2010-2011 products on Windows XP, Windows Vista, and Windows 7. For instructions on configuring other security software, see Configure firewalls so that Firefox can access the Internet. After updating or installing Firefox, the firewall
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