Well-known ports | HP Norton Personal Firewall 2003 specs

About the Internet 123

How computers are identified on the Internet

Well-known ports

Following are some of the most common well-known ports.

Default port	Service name	Program

20	ftp-data	FTP (File Transfer Protocol) data

21	ftp	FTP (File Transfer Protocol) control

23	telnet	Telnet terminal handler

25	smtp	SMTP (Simple Mail Transfer Protocol)

53	domain	DNS (Domain Name Service) lookup

79	finger	Finger

80	http	HTTP (Hypertext Transfer Protocol)

110	pop3	POP3 (Post Office Protocol 3)

113	auth	Ident Authentication Service

119	nntp	NNTP (Network News Transfer Protocol)

137	nbname	NetBIOS name (Microsoft Networking)

138	nbdatagram	NetBIOS datagram (Microsoft
		Networking)

139	nbsession	NetBIOS session (Microsoft Networking)

143	imap	IMAP (Internet Message Access Protocol)

194	irc	IRC (Internet Relay Chat)

389	ldap	LDAP (Lightweight Directory Access
		Protocol)

443	https	HTTPS (Secure HTTP)

How computers are identified on the Internet

Millions of computers are connected to the Internet. When you are trying to identify computers, it is easier to work with groups of computers rather than having to identify each one individually. Subnet masks provide a way to identify a group of related computers, such as those on your local network.

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HP Norton Personal Firewall 2003 manual How computers are identified on the Internet, Well-known ports

Contents

User’s Guide Norton Personal Firewall User’s Guide Symantec License and Warranty Disclaimer of Damages Contents Chapter Norton Personal Firewall basics Chapter Controlling access to protected computers Chapter Protecting your privacy Appendix Troubleshooting Norton Personal Firewall Contents Responding to emergencies If you think your computer is under attackTo block and investigate an attack Action Description Recover from an emergency Prevent future problems Prevent future problems What’s new in Norton Personal Firewall About Norton Personal Firewall Norton Personal Firewall features About Norton Personal Firewall Norton Personal Firewall features include System requirements Installing Norton Personal Firewall Requirements Supported email clients Prepare your computer Before installationIf you’re using Windows XP Supported instant messenger clients Install Norton Personal Firewall To disable the Windows XP firewallTo install Norton Personal Firewall Install Norton Personal Firewall Click Next Register your software If the opening screen does not appearTo register your software Register your software Register your software Use the Security Assistant After installationSet up Home Networking Restart your computer To set up Home Networking Set up Program Control To set up Program Control Set up Privacy Control To set up Privacy Control Set up Password Protection To open Norton SystemWorks from Norton Personal Firewall If you have Norton SystemWorks installedTo protect Norton Personal Firewall options with a password To open Norton Personal Firewall from Norton SystemWorks If you need to uninstall Norton Personal Firewall To uninstall Norton Personal FirewallTo uninstall LiveReg and LiveUpdate Access Norton Personal Firewall To access Norton Personal FirewallNorton Personal Firewall basics To use the Norton Personal Firewall system tray menu Access Norton Personal Firewall from the system tray Access Norton Personal Firewall protection features To change settings for individual featuresWork with Norton Personal Firewall Use the Security Monitor To view the Security MonitorTo view the Security Center Respond to Norton Personal Firewall alerts Select a task with the Security MonitorLearn more with the Alert Assistant Adjust the Alerting Level To adjust the Alerting LevelTo use the Alert Assistant To view or hide Alert Tracker Use Alert Tracker To hide Alert Tracker from the system tray menu Check your computer’s vulnerability to attackTo review recent Alert Tracker messages To move Alert Tracker To trace a connection attempt from the Log Viewer Identify the source of communicationsTo get more information about an at-risk area To trace a connection attempt from Statistics Stop Internet communication with Block Traffic About Firewall options About LiveUpdate optionsCustomize Norton Personal Firewall About General options Password-protect options About Web Content optionsAbout Email options To temporarily disable Norton Personal Firewall Temporarily disable Norton Personal FirewallReset options password To reset your Norton Personal Firewall options password Look up glossary terms Use online Help To disable a protection featureTo access Help For more information To read the Readme file To access window or dialog box HelpReadme file and Release Notes Window and dialog box Help To read the Release Notes To install Adobe Acrobat Reader To read the User’s Guide from your hard disk To access the Symantec Web site in your browserAbout Norton Personal Firewall on the Web Explore online tutorials To subscribe to the Symantec Security Response newsletter Subscribe to the Symantec Security Response newsletter About program updates Keeping current with LiveUpdate About your subscription About protection updates To request an update alert When you should updateIf you run LiveUpdate on an internal network Request an update alert To obtain updates from the Symantec Web site If you can’t use LiveUpdateObtain updates using LiveUpdate Set LiveUpdate to Interactive or Express mode Turn off Express mode To set LiveUpdate to Interactive or Express modeTo turn off Express mode Notify me To disable Automatic LiveUpdate Run LiveUpdate automatically Connect to a network Control how people use your computer Enable file and printer sharing To enable file and printer sharingOrganize computers into network zones To open the Home Network Wizard from the Security Monitor To open the Home Network Wizard from the Security Center Identify computers to Norton Personal Firewall To manually add computers to zonesTo remove computers from zones To find an IP address with Winipcfg To find an IP address with IpconfigFind a computer’s IP address Specify an individual computer If you use Dhcp Specify computers using a network addressTo specify computers using a network address Specify a range of computers If multiple computers share a single Internet connection Control how users access the InternetControl how outside users access your network If you access the Internet via a cable or DSL router PGP If you run a Virtual Private Network Guarding against intrusion attempts Intrusion Detection analyzes communications Norton Personal Firewall monitors communications Visual Tracking locates attackers Customize firewall protection Change the Security Level sliderTo change the Security Level slider To change individual security settings Change individual security settings Click Custom Level How firewall rules are processed Reset security settings to defaultsTo reset security settings to defaults Customize firewall rules Create new firewall rules Enable Automatic Program Control To enable Automatic Program Control Scan for Internet-enabled programs To add a program to Program Control Manually add a program to Program Control To change Program Control settings Change Program Control settings Manually add a firewall rule To add a General RuleTo add a Trojan Horse Rule Write a firewall rule To add a Program RuleTo write a firewall rule TCP UDP Select the ports the rule should monitor. Your options are Change an existing firewall rule Temporarily disable a firewall rule Change the order of firewall rulesRemove a firewall rule To remove a firewall rule Reset firewall rules to the default settingsCustomize Intrusion Detection Exclude specific network activity from being monitored To include attack signatures To unblock computers currently blocked by AutoBlock Enable or disable AutoBlockTo enable or disable AutoBlock Unblock computers To restrict a blocked computer Exclude computers from AutoBlockRestrict a blocked computer To exclude specific computers from AutoBlock Identify private information to protect Protecting your privacy Privacy Control and SSL Add private informationTo add private information To modify or remove private information Customize Privacy ControlModify or remove private information Set the Privacy Level To set the Privacy Level Adjust individual Privacy Control settingsChange the Private Information setting To change the Private Information setting To change the Cookie Blocking setting Change the Cookie Blocking setting Enable or disable Browser Privacy Disable or enable secure Web connectionsTo enable or disable Browser Privacy Blocking by dimensions Blocking Internet advertisementsHow Ad Blocking works Enable or disable Ad Blocking To enable or disable Ad BlockingBlocking by location To enable or disable Popup Window Blocking Enable or disable Popup Window Blocking To use the Ad Trashcan Enable or disable Flash blockingTo enable or disable Flash blocking Use the Ad Trashcan Click Open the Ad Trashcan. The Ad Trashcan window appears Use text strings to identify ads to block or permit How to identify Ad Blocking strings Add an Ad Blocking stringTo add an Ad Blocking string To modify or remove an Ad Blocking string Modify or remove an Ad Blocking string Use text strings to identify ads to block or permit Monitoring Norton Personal Firewall To view the Statistics window View the Status & Settings windowTo view the Status & Settings window View the Statistics window Reset information in the Statistics window To reset information in the Statistics windowReview detailed statistics Reset detailed statistics counters To reset countersTo review detailed statistics View Norton Personal Firewall Logs To view the logs View the logs Clear the logs Refresh the logs To change the size of a log Change the size of the logs To explore the Symantec service and support Web site Troubleshooting Norton Personal Firewall Troubleshoot Norton Personal Firewall problems What is wrong with this Web site?To search the Symantec service and support Web site Why did an email message I sent never arrive? Why can’t I post information online? To make your NetBIOS name visible Why can’t I connect to the Internet via my cable modem? To allow ISP port scans How can a Web site get my browser information? Troubleshoot Norton Personal Firewall problems About the Internet How information is transmitted over the Internet 119 About Igmp How Web information is located on the InternetAbout UDP About Icmp Understanding URLs Requesting a How ports identify programs on servers How ports identify programs on servers Well-known ports How computers are identified on the Internet 124 About the Internet Understanding Internet risks Risks from hackersProcess of a hacker attack Information gathering Privilege escalation Initial access Covering tracks Risks from active content Blocking site and newsgroup categories Risks from inappropriate content and activitiesRestricting access to programs Risks to your privacy Bad cookies Understanding cookiesBlocking cookies Good cookies Tracking Internet use Risks from Trojan horses and viruses Likelihood of being attacked Glossary Domain Download IP Internet Protocol IP address Internet Protocol address Network address Operating system Glossary Web Web site World Wide Web WWW Glossary Customer service Service and support solutions Technical support Subscription policySupport for old and dis versions Service and support offices Worldwide service and support Service and support solutions Index Index Index Index Index 150 Index Norton Personal Firewall