Tag Archives: Firewall

What is a firewall?

What is a firewall?

A firewall is a software program or piece of hardware that helps screen out hackers, viruses, and worms that try to reach your computer over the Internet. If you can’t start Windows Firewall or you are getting an error, use Microsoft free tool to diagnose and fix problems.

firewall

firewall

  • If you use a computer at home, the most effective and important first step you can take to help protect your computer is to turn on a firewall.
  • Windows 8, Windows 7, Windows Vista, and Windows XP SP2 or higher have a firewall built-in and turned on by default. (Note: Support for Windows XP ended in April 2014.)
  • If you have more than one computer connected in the home, or if you have a small-office network, it is important to protect every computer. You should have a hardware firewall (such as a router) to protect your network, but you should also use a software firewall on each computer to help prevent the spread of a virus in your network if one of the computers becomes infected.
  • If your computer is part of a business, school, or other organizational network, you should follow the policy established by the network administrator.

Automatically diagnose and fix problems with Windows Firewall

Follow these steps to automatically repair Windows Firewall problems:
 
    • Select the Download button on this page.
    • In the File Download dialog box, click Run or Open, and then follow the steps in the Windows Firewall Troubleshooter.
Notes
  • This troubleshooter might be in English only. However, the automatic fix also works for versions of Windows in other languages.
  • If you’re not on the computer that has the problem, save the troubleshooter to a flash drive or a CD, and then run it on the computer that has the problem.
Download
What it fixes
    • Windows Firewall isn’t the default firewall
    • Windows Firewall doesn’t start
    • Windows couldn’t start Windows Firewall (Service-specific error 5 (0x5))
    • Remote Assistance isn’t working because it’s blocked by Windows Firewall
    • You’re unable to access shared files and printers because sharing is blocked by Windows Firewall
    • BFE service is missing
    • Firewall won’t start (Error Code 80070424)
Runs on
    • Windows 7
    • Windows 8
    • Windows 8.1
    • Windows 10

List of Firewall appliances Company in India

List of Firewall appliances Company in India

In general, a computer appliance is a computing device with a specific function and limited configuration ability, and a software appliance is a set of computer programs that might be combined with just enough operating system (JeOS) for it to run optimally on industry standard computer hardware or in a virtual machine.

A firewall appliance is a combination of a firewall software and an operating system that is purposely built to run a firewall system on a dedicated hardware or virtual machine. These include:

  • embedded firewalls: very limited-capability programs running on a low-power CPU system,
  • software-based firewall appliances: a system that can be run in independent hardware or in a virtualised environment as a virtual appliance
  • hardware-based firewall appliances: a firewall appliance that runs on a hardware specifically built to install as a network device, providing enough network interfaces and CPU to serve a wide range of purposes. From protecting a small network (a few network ports and few megabits per second throughput) to protecting an enterprise-level network (tens of network ports and gigabits per second throughput).

The following table lists different firewall appliances lists.

Firewall License Cost OS
Check Point Proprietary Included on Check Point
security gateways
Proprietary operating system Check Point IPSO
and Gaia (Linux-based)
FortiGate Proprietary Included on all Fortigate
devices
Proprietary, FortiOS
Palo Alto Networks Proprietary Included on Palo Alto
Networks firewalls
Proprietary operating system PANOS
WatchGuard Proprietary Included on all
WatchGuard firewalls
Proprietary operating system
Sophos Proprietary Included on Sophos UTM Linux-based appliance
Cisco Asa Firepower Proprietary Included on all CISCO
ASA devices
Proprietary operating system
Cisco PIX Proprietary Included on all CISCO
PIX devices
Proprietary operating system
Mcafee Firewall Proprietary Included on Intel Security Appliance Linux-based appliance
Juniper SSG Proprietary Included on Netscreen
security gateways
Proprietary operating system ScreenOS
Juniper SRX Proprietary Included on SRX
security gateways
Proprietary operating system Junos
Sonicwall Proprietary Included on Dell appliance Proprietary operating system SonicOs
Barracuda Firewall Proprietary Included Firewall Next Generation appliance Windows-based appliance
embedded firewall distribution
Cyberoam Proprietary Included Firewall Sophos appliance Windows-based appliance
embedded firewall distribution
D-Link Proprietary Included Firewall DFL Windows-based appliance
embedded firewall distribution
Endian Firewall Proprietary Free / Paid Linux-based appliance
Opendium Iceni Proprietary Free / Paid Linux-based, with optional web filtering / auditing.
IPCop GPL Free / Paid Linux-based appliance
firewall distribution
pfSense ESF/BSD Free / Paid FreeBSD-based appliance
firewall distribution
IPFire GPL Free / Paid Linux/NanoBSD-based appliance
firewall distribution
Untangle GPL Free / Paid Linux/NanoBSD-based appliance
firewall distribution
Zeroshell GPL Free / Paid Linux/NanoBSD-based appliance
firewall distribution
SmoothWall GPL Free / Paid Linux-based appliance
embedded firewall distribution
WinGate GPL Free / Paid Windows-based appliance
embedded firewall distribution
Calyptix Security BSD Free OpenBSD-based appliance
firewall distribution
Halon Security BSD Free OpenBSD-based appliance
Vantronix BSD Free OpenBSD-based appliance