Keep secured your software in firewalls

What is firewalls:
Firewalls is software used to maintain the security of a private network. Firewalls block unauthorized access to or from private networks and are often employed to prevent unauthorized Web users or illicit software from gaining access to private networks connected to the Internet. A firewall may be implemented using hardware, software, or a combination of both.

Firewalls is recognized as the first line of defense in securing sensitive information. For better safety, the data can be encrypted.
Broadly speaking, a computer firewall is a software program that prevents unauthorized access to or from a private network. Firewalls are tools that can be used to enhance the security of computers connected to a network, such as LAN or the Internet. They are an integral part of a comprehensive security framework for your network.

A firewall absolutely isolates your computer from the Internet using a “wall of code” that inspects each individual “packet” of data as it arrives at either side of the firewall — inbound to or outbound from your computer — to determine whether it should be allowed to pass or be blocked.




What firewalls do:

Firewalls have the ability to further enhance security by enabling granular control over what types of system functions and processes have access to networking resources. These firewalls can use various types of signatures and host conditions to allow or deny traffic. Although they sound complex, firewalls are relatively easy to install, setup and operate.

Most people think that a firewall is a of device that is installed on the network, and it controls the traffic that passes through the network segment.
However, you can have a host-based firewalls. This can be executed on the systems themselves, such as with ICF (Internet Connection Firewall). Basically, the work of both the firewalls is the same: to stop intrusion and provide a strong method of access control policy. In simple definition, firewalls are nothing but a system that safeguards your computer; access control policy enforcement points.

Basically, firewalls need to be able to perform the following tasks:

Defend resources
Validate access
Manage and control network traffic
Record and report on events
Act as an intermediary


What is Personal Firewalls 

It is important to understand why we need a firewall and how it helps us in the world of secure computing. We need to understand the goals of information security because it helps us to understand how a firewall may address those needs.


Why you need Personal Firewalls

In the age of high-speed Internet Access, you electronically connect your computer to a broad network over which, unless you have installed a personal firewall, you have limited control and from which you have limited protection. Until recently, unless you worked for an organization that provided high-speed internet access.Like anything, the high-speed connection has its own drawbacks. Ironically, the very feature that makes a high-speed connection attractive is also the reason that makes it vulnerable. In a way, connecting to the internet via high-speed connection is like leaving the front door of your house open and unlocked. This is because high-speed Internet connections have the following features:

A constant IP – Make it easy for an intruder who has discovered your computer on the internet to find you again and again.
High-Speed Access – Means that the intruder can work much faster when trying to break into your computer.
Always active connection – means that your computer is vulnerable every time when it is connected to the internet.


A Personal firewalls is important when

You surf the internet at home using an ‘always on’ broadband connection
You connect to the internet via a public WiFi network in a park, cafe or airport
You run a home network which needs to be kept isolated from the internet
You wish to be kept informed when any program on your computer attempts to connect to the internet
Most Personal Firewalls are highly configurable so you can easily create security policies to suit your individual needs.


Advantage of firewalls:

A firewall protects your computer by acting as a gate through which both all data must pass. By blocking certain kinds of traffic, the firewall protects your computer or network from unauthorized users and safeguards your data from attack.

Disadvantage of firewalls:

The main disadvantage of a firewall is that it cannot protect the network from attacks from the inside. They often cannot protect against an insider attack. Firewalls cannot protect a network or pc from viruses, Trojans, worms and spyware which spread through flash drives, potable hard disk and floppy etc.

Block a program’s internet access with Windows 8 firewalls:

If you have some peculiar program installed that you need to have but want all its internet communication blocked you can do that easily with Windows’ built in firewall. On Windows 8 just hit the Windows key to get to the main menu and
– type Firewall.
– Click on Settings on the right pane and
– go to Windows Firewall.
– Click on Advanced settings on the left side of the window.
– On the left pane of the new window, right-click on Outbound Rules and
– select New rule…


Unblock a program’s internet access with Windows 8 firewalls:

From the Start Screen, click the Desktop tile. …
From the Desktop, hover in the lower right-hand corner to access the Charms.
Select Control Panel from the Settings charm. …
Click on System and Security. …
Click on Windows Firewall.

Block a program in Windows 10 in Firewalls:

Blocking a program within Windows Firewall is pretty straightforward. Just don’t be put off by the interface as there is a lot going on.

1. Navigate to Control Panel, System and Security, Windows Firewall and Advanced Settings.
2. Highlight Outbound Rules in the left pane.
3. Select New Rule in the right pane and select Program from the next box.
4. Select ‘This program path:’ and select the program you want to block. Then click Next.
5. Select ‘Block the connection’ and then click Next.
6. Select all network types in the next window and click Next.
7. Name it something meaningful. I tend to add the name of the program into the title so I can tell at a glance.
8. Right click your new rule and select Properties.
9. Click Settings next to Services and select ‘Apply to this service’.
10. Select the service associated with the program you’re blocking. Not all programs install services so don’t worry if there isn’t a corresponding service. Click OK either way.


Unblock a program in Windows 10 in Firewalls:

That’s it. You have now blocked a program in Windows Firewall. If you want to temporarily allow access for an update, simply right click and disable the rule. Then enable it once the operation is complete

Step 1: Right-click on the blocked file, and select Properties.
Step 2: Go to General tab and check the Unblock box at the bottom.
Step 3: If prompted, click on Continue.



Firewall is a barrier between Local Area Network (LAN) and the Internet. It allows keeping private resources confidential and minimizes the security risks. It controls network traffic, in both directions.

The following diagram depicts a sample firewall between LAN and the internet. The connection between the two is the point of vulnerability. Both hardware and the software can be used at this point to filter network traffic.



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