How does a firewall protect an organisation's network?
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A firewall is a piece of software that sits between two networks and regulates what traffic can go back and forth. Typically a firewall is a device that sits between a company's network and it's ISP, but it may also be a piece of software sitting between your computer and your cable modem.\n    Firewalls protect networks and users by only allowing certain types of traffic into and out of them. Most corporate firewalls are configured to allow OUT only web browser traffic by users (HTTP/HTTPS/FTP) and allow IN only Mail, VPN, and Web traffic to specific machines.\n    By restricting traffic allowed in to specific protocols and specific machines, users are protected from people trying to snoop around a network. Also, by restricting traffic allowed out, some spy-ware and other malicious software can be prevented from communicating.\n    Firewalls are configured by defining rules, specifically which ports and addresses to allow and restrict. A typical firewall rule says allow any machine on the inside network to communicate with any machine outside on port 80 and 443 (http and https). Some more secure firewalls are smart enough to look at the traffic and determine if it's truly http, instead of relying only on the port number. \n    Another rule may be to allow any outside computer to talk to the IP of a company's web server on port 80 only. This creates a "hole" in the firewall, allowing people on the outside access to the webserver through their browser. \n    Firewalls are often combined with other technologies, such as NAT and load balancers to provide additional security and other non-security related functions.
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thats what a firewall is for to stop hackers from getting in to your computer try zonealarm basic firwall its free
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You set your firewall if you have one to a higher setting...
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You're making several connections:\nYour home PC to your firewall\nFirewall to corporate firewall (assuming one exists)\nCorp firewall to work PC\n\nFirewall to firewall is actually several connections, but for your purposes, you can think of it as one.  \n\nEach firewall has to allow the connection for NetMeeting, which means your firewall has to allow it outbound and the work firewall has to allow it inbound.  To allow a connection, on a firewall, is to allow traffic (TCP, UDP, or both) on a certain port or ports.  NetMeeting uses five different TCP ports that you have to open - see the gray box on the page under Sources.\n\nOpen the ports on your firewall, make sure they're open on any corporate firewall that your work machine sits behind, and you should be okay.
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It depends on which firewall, and there are many kinds (both software and hardware). Most people probably have Windows XP's firewall, which can be turned on/off from the Control Panel.
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you may be hindered by a firewall
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If the company's firewall does not block outbound connections, you can set up an SSH tunnel to your home computer and surf all you like. (Of course, someone might ask you about the SSH connection, but they can't monitor the encrypted traffic.)\n\nNote that this would not prevent the company from using keystroke monitoring -- or even software to mirror what you see -- but if you try to shut that down, they'll notice for sure.\n\n<disclaimer>\nIf you don't know how to set up the tunnel, I'm not going to tell you. Your company has every right to monitor your activities while they are paying you to work. And if you get fired for setting up a tunnel, don't be surprised.\n</disclaimer>\n\nNote to managers and firewall admins:\n\nBlocking outbound connections to the SSH destination port (port 22) does not prevent SSH tunnels to arbitrary ports. For example, if you only allow outbound HTTP (port 80), an employee can simply configure sshd to listen on port 80 at home. Once such a connection is made, your internal network is only as secure as the employee's home computer!\n\nThe best way to prevent this type of abuse is to use proxy HTTP and block ALL outbound Internet connections. Hiring trustworthy employees is even more important, of course.
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It may be behind a firewall...
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www.firewallsucks.com\n\nthis works.
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(m)\n\nA firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy, analogous to the function of firewalls in building construction. \n\nTrojan: Small malicious programs that are delivered secretly or benignly to your computer as executable files (usually through email, chat lines, FTP, Freeware or Shareware programs, MP3s or even movies)-just like the Trojan Horse, innocent looking on the outside, but containing a nasty surprise hidden inside. It is really two programs-one on your computer ("server") and the other on the cracker's ("client"). This server runs automatically every time the computer is started. A Trojan program gives the cracker complete access to your computer. There are thousands of different Trojan programs.  Trojans need user intervention to install (the file needs to be opened) and do not self-replicate like viruses.
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In internet explorer, look under [Tools]  [Internet Options] [Security]  and you cablock them there, or better yet, get a firewall
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A firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy. It is like a Border Protection Device.\nA firewall has the basic task of controlling traffic between different zones of trust. Typical zones of trust include the Internet (a zone with no trust) and an internal network (a zone with high trust).\nThe ultimate goal is to provide controlled connectivity between zones of differing trust levels through the enforcement of a security policy and connectivity model based on the least privilege principle.
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To make a secure LAN u have to install a firewall in each system and configure it such to enable the essential required services like accesing Internet, yahoo messenger, msn etc. and acces to other systems.\n\nThe gateway should be configured to configured for acess to internet and all the other services should be blocked and all the other activites should be logged.
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A good firewall blocks all malicious communications and data (Inbound and Outbound data), and good anti-virus detects and prevents viruses ,so if you install firewall and antivirus you will be safe in the aspect of internet security. For downloading free zone alarm see link below, \nI suggest to you install Norton antivirus too.
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Norton Internet Security, McAfee, Kerio.\n\nBasically the first time you open up the p2p client your firewall will ask you if you want to allow this program access and you click allow access in all ports permanently and then you're set
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Get an application based firewall like zonealarm. \nhttp://www.zonelabs.com/
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well its very difficult to bypass firewall\nyou have to find a bug in their firewall\nand their is no other way as they are meant for stopping these things