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What are firewalls?


Firewalls are security devices that sits between a private network or endpoint and a public network. Their purpose is to block unauthorized access while permitting authorized communications. Firewalls can be implemented through hardware or software, or a combination of the two. All messages entering or leaving the protected private network pass through the firewall, which examines each message against a set of rules and other criteria; blocking those that do not meet the specified criteria.

Articles Tagged - firewalls

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Hacker 'handshake' hole found in common firewalls
Wednesday, April 13, 2011
Hacker 'handshake' hole found in common firewalls
Lab says five devices can let a hacker remotely fool the firewall into thinking an IP connection is a trusted one. They are trying to fix the problem.
Five tips to improve your security posture
Wednesday, July 21, 2010
Five tips to improve your security posture
Our readers’ advice for quick-hit, no-excuses security. Get tips on password administration, firewalls, security testing, and more
Four over-rated security technologies
Wednesday, March 10, 2010
Four over-rated security technologies
A database security expert says anti-virus packages offer little advanced protection while others complain identity and access management products do not work as advertised. Some users say network access control takes years to configure properly and question the use of firewalls
Network security threats to watch in 2010
Wednesday, January 13, 2010
Network security threats to watch in 2010
Good patching procedures and outbound firewall rules will go far in protecting your organization from botnets, but hackers are now targeting Adobe Acrobat, the Symbian mobile operating system and other software. How to protect yourself from the threats of 2010
How we tested Cisco IPS 7.0
Tuesday, August 11, 2009
How we tested Cisco IPS 7.0
Network World tested version 7 of the software upgrade to Cisco’s intrusion prevention appliances. Find out how we reviewed the reputation services feature
Top 10 sizzling firewall snafus
Thursday, June 25, 2009
Top 10 sizzling firewall snafus
Here are some of the most common-yet-nerve-sizzling firewall snafus that have kept many an admin on a Friday-to-Sunday diet of fast food and Red Bull
Secure Passage intros firewall analysis tool
Monday, February 23, 2009
Secure Passage intros firewall analysis tool
FireMon software is designed to analyze firewall policies for different zones of traffic and identify unintended effects. Find out what it displays
SonicWall adds muscle to UTM, SSL VPN lines
Monday, January 12, 2009
SonicWall adds muscle to UTM, SSL VPN lines
The company adds the TZ 210 to the top of its unified threat management appliances for SMBs, while improves the firmware for its Aventail remote access devices
Virtualization boosts security threat
Thursday, January 31, 2008
Virtualization boosts security threat
As IT managers increasingly turn to virtualization to reduce the number of servers they have to deal with, they may unknowingly also be increasing their security problems
A knack for network access control
Wednesday, August 01, 2007
A knack for network access control
Network access control is a huge topic of discussion in IT and a focus of activity among vendors. Over time, the acronym has become almost generic through overuse and the definition varies.
Network trouble made nuke plant shut down
Wednesday, May 30, 2007
Network trouble made nuke plant shut down
Water pumps need firewalls too.That’s what operators of the Tennessee Valley Authority’s (TVA) Browns Ferry Nuclear Plant discovered last August when they were forced to manually shut down one of their plant’s two reactors after networking problems caused two water pumps to fail and threatened the stability of the plant itself.
Swapping out firewalls easier said than done
Thursday, May 25, 2006
Swapping out firewalls easier said than done
Moving from one brand of gateway firewall to another is proving to be a daunting task that corporate customers say takes six or more months because of a lack of industry standards and dearth of migration tools.
Ingate expands into South Africa
Wednesday, March 15, 2006
Ingate expands into South Africa
Firewall technology specialist, Ingate Systems, says that it is expanding sales into this country through a distributor agreement with i-Security. CEO of i-Security, Jeremy Miller, explains that the Ingate Firewalls and SIParators connect to an existing network firewall to enable SIP communications.
Interface can make configuration friendly
Thursday, February 02, 2006
Interface can make configuration friendly
Trite but true: Your company’s data is its most important asset. This applies to your databases, data files, e-mail stores and yes, even router configurations. The infrastructure device settings you’ve meticulously and painstakingly programmed into your routers, switches and firewalls deserve as much careful management as your databases.
Senior manager of security product management at Cupertino, Calif.-based Symantec Managed Security Services
Thursday, December 08, 2005
Senior manager of security product management at Cupertino, Calif.-based Symantec Managed Security Services
Outsourcing of IT security services will increase dramatically over the next five years despite fears about turning over the keys to the company to an outside entity. IDC Canada estimates that the market for security services in Canada was $436 million in 2004. By 2009, says Joe Greene, IDC Canada’s vice-president of security research, it will be $846 million — almost doubling in a five-year period.
Enterprise information integration
Tuesday, November 15, 2005
Enterprise information integration
The lifeblood of the modern enterprise is information. This isn't news. But as organizations collect more and more information from different sources and applications, it's increasingly difficult to deal with that information.
Avoiding holes in your VoIP
Thursday, November 10, 2005
Avoiding holes in your VoIP
Ottawa-based startup VoIPshield Systems Inc. is marking time on the release of protection products for voice over Internet Protocol (VoIP) applications, but last month released VoIP-specific auditing software as its first product.
The age of video?
Thursday, October 13, 2005
The age of video?
I received the call: I was needed on a project, but was I available? I was. My contact, however, was not. He’d gone AWOL. When he called me back a few days later he apologized for having been unavailable. However, he didn’t claim that it was work that had occupied his time. In fact, by way of explanation he referred back to his old days at 3M. “You know what 3M stands for? Meetings, meetings, meetings.
NEC developing network security analysis system
Wednesday, March 23, 2005
NEC developing network security analysis system
NEC Corp. is developing a network security system that will automatically monitor and analyze the configuration of security tools deployed in a network and suggest changes to fix vulnerabilities and any redundancies that exist between them, the company announced Tuesday.
Polycom, Edgewater overcome firewalls, NAT systems
Thursday, November 25, 2004
Polycom, Edgewater overcome firewalls, NAT systems
Polycom Inc. and Edgewater Networks Inc. have teamed to help users get over one of the biggest hurdles when it comes to IP videoconferencing adoption: Getting through firewalls and network address translation (NAT) systems unscathed.
AT&T extending network expertise to security
Sunday, October 31, 2004
AT&T extending network expertise to security
Instead of making the carriers and telecommunications providers nothing more than dumb pipelines, carriers of data traffic only, say AT&T officials, why not make the network intelligently tackle security problems before those problems can reach a customer’s system?
SSL vulnerability could bring down Cisco LAN/WAN gear
Tuesday, March 16, 2004
SSL vulnerability could bring down Cisco LAN/WAN gear
Cisco Systems Inc. warned that an implementation of Secure Sockets Layer on some of its switches, routers and firewalls could leave these devices vulnerable to a denial-of-service attack.
New year, same security problems
Thursday, January 22, 2004
New year, same security problems
Will 2004 bring more of the same, or will it be remembered as the year in which Internet users "took back the streets" from virus writers, malicious hackers, and spammers?
How much security
Sunday, November 30, 2003
How much security
Who plays more games? The people trying to penetrate networks and wreak havoc, or the vendors who dream up products and services to thwart them?
Gartner pans current intrusion detection systems
Thursday, September 11, 2003
Gartner pans current intrusion detection systems
Money slated for intrusion detection should be invested in firewalls, according to research firm Gartner, Inc. Gartner claims its Information Security Hype Cycle released in June shows that intrusion detection system (IDS) technology does not add an additional layer of security as promised by vendors.
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