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	Encyclopedia: Port scan
		Ports only exist if there are services running on the computer which have caused the port to come into existence.
		Ports are places where data can enter the computer, and be run by a process on the computer.
		Running a port scan without permission is seen as unethical and most Internet Service Providers disallow it in their Acceptable Use Policies.
	www.nationmaster.com /encyclopedia/Port-scan (548 words)

	Port Scan Detectors
		These scans gave interesting results, but became so common that port scan detectors were quickly designed to set off alarms if the computer under attack noticed doors being accessed like this in a sequential manner.
		Port Scanner checks to see which ports are open on an IP address and reads any data sent when it connects.
		Port Scan Attack Detector (psad) is a collection of three lightweight system daemons written in Perl and C that are designed to work with Linux iptables firewalling code to detect port scans and other suspect traffic.
	www.softpanorama.org /Security/port_scan_detectors.shtml (2629 words)

	Examining port scan methods - Analyzing Audible Techniques (Site not responding. Last check: 2007-10-21)
		With an epidemic of port scan instances occurring each and everyday, it should be recognized the ways an attacker could probe network hosts using a variety of techniques aimed to avoid detection whilst obscuring the sender's true source.
		Port scanning is one of the most popular techniques used in the wild to discover and map services that are listening on a specified port.
		Using, the FTP PORT command to set a clients passive mode, a host is able to determine the status of a port by issuing an IP and port as arbitrary parameters to connect to.
	secinf.net /misc/Examining_port_scan_methods__Analyzing_Audible_Techniques_.html (4248 words)

	Freeware Download: Port Scan
		Ports may be opened by a legitimate program and that is OK. The opened port is only a problem if it was opened by a malicious program.
		Port Mapper is a freeware tool which helps home users open/close ports in their routers and gateways securely.
		Port Mapper is more secure than manually opening and closing ports, because it opens the ports only when needed and automatically closes them when you are finished playing.
	www.dirfile.com /freeware/port-scan.htm (2848 words)

	TCP/UDP Port Scan Attack (Site not responding. Last check: 2007-10-21)
		Port Scan Attack is one of the most popular reconnaissance techniques attackers use to discover services they can break into.
		Port scanning usually happens for TCP ports, which are connection-oriented and therefore give good feedback to the attacker.
		The Port Scan attack can be effectively reduced (if not completely solved) by deploying Firewalls at critical locations of a network to filter un-wanted traffic and from iffy sources.
	javvin.biz /networksecurity/PortScanAttack.html (430 words)

	Port Scanning / Internet Security Lectures by Prabhaker Mateti
		Port Scanning is one of the most popular reconnaissance techniques attackers use to discover services they can break into.
		The simplest port scan tries (i.e., sends a carefully constructed packet with a chosen destination port number) each of the ports 0..65535 on the victim to see which ones are open.
		Port scanning usually means scanning for TCP ports, which are connection-oriented and therefore give good feedback to the attacker.
	www.cs.wright.edu /~pmateti/Courses/499/Probing (3042 words)

	broadband » Secure-Me - Automated security testing (Site not responding. Last check: 2007-10-21)
		As the millions of personal computers of the world move from dialup lines to permanent connections such as DSL or cable, a vast new array of potentially soft targets turn up on the Internet, at stable IP addresses, for crackers to use, sometimes for fun, and sometimes to stage further break-ins.
		Automated scan tools can quickly pass over an entire domain, and report on machines that appear to be insecure.
		Any intruder will use a scanning tool to get an overview of your security, either as part of a domain pass, randomly, or because they are targetting you specifically.
	www.dslreports.com /secureme (750 words)

	HackerWatch.org: Port Scan (Site not responding. Last check: 2007-10-21)
		port indicates that the port is reachable but there is no program currently accepting connections there.
		This port is not being blocked, but there is no program currently accepting connections on this port.
		If these ports were not deliberately left open, there may be a problem with your firewall operation or configuration.
	probe.hackerwatch.org /probe/probe.asp (288 words)

	Online Port Scanner
		Use this tool to scan individual ports in order to determine if a machine is listening on that port.
		Ports are hardware locations for passing data in and out of a computing device.
		Personal computers have various types of ports, including internal ports for connecting disk drives, monitors, and keyboards, as well as external ports, for connecting modems, printers, mouse devices, and other peripheral devices.
	t1shopper.com /tools/port-scanner (256 words)

	broadband » Port scan
		Note: Interesting scan results, with your IP address removed, may be shown publicly to the left of the scan applet.
		The TCP (full connect) scan starts first, and results are shown as ports are found.
		The maximum test duration is 60 seconds for the TCP scan and 60 seconds for the UDP scan..
	www.dslreports.com /scan (231 words)

	ZTPS Home
		Because a port scan is sometimes, very rarely, a prelude to hacking attempts, many fascist leaning system administrators mistakenly classify the port scan itself as a hostile act.
		But just because a port scan may on rare occasions reveal an exploitable weakness, it is not the same as actually exploiting the weakness.
		Designed to be opened in a smallish browser window and minimized for all day scanning at home, work, or school, the ZTPS applet will scan a random port on a particular machine (chosen by the implementers posting the ZTPS site), from once per minute to once per hour, selectable by the user.
	switch.sjsu.edu /v6n2/ztps (1177 words)

	Nmap: The Art of Port Scanning
		Fragmentation scanning : This is not a new scanning method in and of itself, but a modification of other techniques.
		For port scanning, our technique is to use the PORT command to declare that our passive "User-DTP" is listening on the target box at a certain port number.
		UDP ICMP port unreachable scanning : This scanning method varies from the above in that we are using the UDP protocol instead of TCP.
	www.insecure.org /nmap/nmap_doc.html (3435 words)

	Network Security Audits / Vulnerability Assessments by SecuritySpace
		A free known port scan does not mean that you don't have trojans.
		If you need to know the status of every port on your system, checking for trojans and such, you can go to the command line and run "netstat -a -n" at the command prompt, and you will be given a list of all open connections, and any ports accepting new connections (in the listening state).
		But just because the port is officially listed as telnet doesn't mean it is. In many cases, trojans are known to co-opt a known port for their own use.
	www.securityspace.com /smysecure/daudit_ports.html (485 words)

	Freeware Download: Port Scan
		Scan a form, load it to Miraplacid Form Designer, add input fields and push a button to open the form in the Miraplacid Form Viewer.
		It features both scheduled and on-demand vulnerability scanning capabilities, based on comprehensive vulnerability database collated from multiple sources and vendors that is constantly kept up-to-date.
		After an initial scan, you can generate a snapshot that includes the current hardware and software information, and allows you to detect changes that were made later by comparing the snapshot with a current scan.
	www.dirfile.com /freeware/port-scan1.htm (2970 words)

	Port Scan List @eHugin
		Scans for these ports should always be considered hostile.
		In some cases, a port might be used by both traditional services (mail, http, etc) and by various trojans.
		Connections to these ports might be the result of curiosity rather than malice: i.e., someone connecting to TCP port 80 might just be wondering if you have a neat web server running, rather than searching for the Executor trojan.
	www.ehugin.com /security/port_list.html (770 words)

	TLab404 Forum: Port-scan
		Get a quick easy no-wait scan for open ports and possibly Windows service exploits Find out how easy or hard it would be for a hacker to gain access to your computer.
		Requests to a Website typically use port 80 and a protocol called "tcp".Requests to gain access to a computer's files or folders typically use ports 137, 138, and 139 and a protocol called "udp".
		Ports 1024 and above are used by clients (your PC) to accept information from a server it has contacted.
	v2.tlab404.com /forum/forum_posts.asp?TID=546&PN=1&get=last (1221 words)

	What's a Port scan? - Ecademy
		I would only bother investigating those port scans where persistent multiple ports are tried from a single address.
		To see what ports you've got open to the outside world, go to http://grc.com and try out the excellent "Shields Up!" series of tests.
		Port scans are (generally) automated attempts to find computers to compromise.
	www.ecademy.com /node.php?id=11743 (586 words)

	Port Scan Security Check - Free firewall check by Secure Design (Site not responding. Last check: 2007-10-21)
		Our Port Scan Security Check is designed to help you discover these problems in order to fix them.
		The Secure Design Port Scan Security Check can give you a report of open ports that may put you at risk to the security threats on this top ten list.
		The scanning test page is complete however more documentation will be provided in the near future.
	www.sdesign.com /securitytest (216 words)

	Don't Port Scan! (Site not responding. Last check: 2007-10-21)
		Port scanning is defined as connecting, or attempting to connect, to a series of ports on a computer (or set of computers) without prior authorization.
		Furthermore, some computers/operating systems are not robust enough to withstand a standard port scan, and as a result, the system or services they provide will often lock up or crash when scanned.
		Except as provided in paragraph (b) of this subsection, a violation of the provisions of subsection (4) of this section shall be a Class A misdemeanor.
	cc.uoregon.edu /cnews/winter2001/noportscan.html (252 words)

	Port scan super, shipping - Port Scan Attack Detector (Download)
		Advanced Port Scanner is a small, fast, easy-to-use and Advanced LAN Scanner 1.0.
		A connect-based TCP port scanner, pinger and hostname resolver.
		PortSentry is a program designed to detect and respond to port scans against a All steps in the installation will happen in super-user account root.
	shipping.yoursuperengine.com /q/shipping-port-scan-super.htm (775 words)

	port scan - a Whatis.com definition
		A port scan is a series of messages sent by someone attempting to break into a computer to learn which computer network services, each associated with a "well-known" port number, the computer provides.
		Port scanning, a favorite approach of computer cracker, gives the assailant an idea where to probe for weaknesses.
		The kind of response received indicates whether the port is used and can therefore be probed for weakness.
	searchsecurity.techtarget.com /sDefinition/0,,sid14_gci214054,00.html (261 words)

	Virus and Port Scan ????/ [Archive] - DR1 Forums (Site not responding. Last check: 2007-10-21)
		not likely I am now sure it was a port scan and invasion precisely when I opened the mail and had DR1 and Bravenet both still running in the background, a number of friends have reported that I sent them the same virus Andy received.
		A port scan just looks for access methods available at a particular port and if there is a hole, someome could you it and there is no trail.
		I for one have not received any virus attempts, but port scans are something that I get hit with every day - they are common and usually harmless.
	www.dr1.com /forums/showthread/t-12447 (1206 words)

	Free Port Scan Test Results - SecurityMetrics (Site not responding. Last check: 2007-10-21)
		A Port Scan requires from 5 seconds to 3 minutes to complete.Your screen will automatically scroll as your port scan results are displayed.
		This free port scan will test 22 of the 500 most commonly used communication ports on your computer/server.
		Your port scan results may not accurately reflect the security of your computer.
	www.securitymetrics.com /portscanlogic.fadp (777 words)

	Port Scan - Web Security Blog (Site not responding. Last check: 2007-10-21)
		Our popular free port scan has been moved to Audit My PC.com - Port Scan Options can be found here.
		Here’s why: If we start to test your firewall for ports 1 to 1024 and your firewall blocks our IP address after port 5, then the remaining ports will appear closed to us when in fact they may actually be open.
		If you are running on a private network, you may be connected through a router, proxy, or firewall and the firewall test may by conducted on that device instead of your computer; if you are unsure, do not perform the port scan.
	www.jamesmaurer.com /port-scan.asp (220 words)

	Security Scan - Sygate Online Services (sos) (Site not responding. Last check: 2007-10-21)
		The information collected from any scan on this site is not used, stored or viewed by Sygate in any way for any reason whatsoever.
		Some of the information we gather by scanning your computer and some of the information we collect from your browser.
		This will show up in your firewall logs as a port scan from scan.sygate.com.
	scan.sygatetech.com (232 words)

	psad (Site not responding. Last check: 2007-10-21)
		EvilFTP, GirlFriend, SubSeven), DDoS tools (mstream, shaft), and advanced port scans (FIN, NULL, XMAS) which are easily leveraged against a machine via nmap.
		When combined with fwsnort, psad is capable of detecting approximately 50% of all Snort rules, including those that inspect the application portion of IP packets.
		In addition, psad makes use of various packet header fields associated with TCP SYN packets to passively fingerprint remote operating systems (in a manner similar to p0f) from which scans originate.
	www.cipherdyne.com /psad (269 words)

	2000301
		A hacker may be scanning your system to see what services are available.
		A false-positive may occur if an application or user is legitimately connecting to several ports; to determine whether this is likely, look at the port to see if it is an expected port number.
		Explains port scanning in depth, and describes the various types of port scans.
	www.iss.net /security_center/advice/Intrusions/2000301 (142 words)

	Nmap - Free Security Scanner For Network Exploration & Security Audits.
		It was designed to rapidly scan large networks, although it works fine against single hosts.
		Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics.
		port scanning mechanisms (both TCP & UDP), OS detection, version detection, ping sweeps, and more.
	www.insecure.org /nmap (524 words)

	Tools FAQ Port Scan (Site not responding. Last check: 2007-10-21)
		The objective of the Port Scan is to see how secure your PC is from people wanting to break into your machine.
		DSLreport's port scan originates from "monitor.dslreports.com" as stated on the port scan page.
		What it does is send various packets that looks for open TCP and UDP ports.
	text.broadbandreports.com /faq/968 (97 words)

	PortDetective.Com - Port Detective tells you whats Open, In Use or Blocked
		The Port Detective performs a remote port scan on your IP address.
		This scan helps you determine if you are properly secured, or if you have the proper ports available and open for hosting a server on your Cable or DSL modem.
		This means the port is blocked or restricted, and you CANNOT host the TCP/IP service on that port.
	www.portdetective.com (270 words)

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