网络上的电脑进行通信，都是通过电脑开放的端口来完成的。形象的说，电脑上每个开放的端口就像一扇打开的门。因此要想保证电脑的安全，则需要守好这些打开的门。
打开“运行”窗口输入“cmd”后回车进入命令提示符窗口，在提示符下首先输入“netstat -an”并回车，其中参数-a的含义表示显示所有连接和侦听端口，-n表示以数字格式显示地址和端口号，命令执行后我们就可以查看详细的端口开放信息了。其中Active Connections表示当前本机活动连接，Proto是指连接时使用的协议名称，Local Address表示本地计算机的IP和连接时使用的端口号，Foreign Address表示连接该端口的远程计算机的IP和端口号，根据这些信息我们就可以轻松查看系统开放的端口。
仅知道开放的端口还是不够的，我们还需要查看开放该端口对应的程序。例如我们判断某个端口可疑，希望了解使用该端口的程序，那么就可以在命令提示符下输入“netstat -ano”，这样除了上面显示的信息外还可以显示活动端口对应的进程标识符（PID）。记录下该PID，然后再运行tasklist，这样即可显示当前系统运行的应用程序和对应的PID。根据记录下来的PID就可以找出对应运行的程序。如果是来历不明的程序，那么就可以将其终止进程了。
其实如果你不习惯在DOS下操作，那么只需要下载一个Active Ports。程序运行后，可以将所有的活动端口都显示出来，同时还包括端口对应的程序、路径、本地和远端IP地址。如果根据这些信息判断是非法的，那么只需要将其选中后单击主界面下方的“结束进程”即可解决。
常用网络端口对应表
对于防火墙很多人不知道如何控制哪几个端口，下面是一些常用的，可以参考一下。
20 ftp-data
21 ftp 22 SSH,pcanywhere 23 telnet 25 smtp 47 VPN 53 DNS 67 BOOTPS 68 BOOTPD/DHCP 69 TFTP 80 WWW-HTTP 106 POPPASSD 109 POP2 110 POP3 137 NETBIOS-NS 138 NETBIOS-DGM(UDP) 139 NETBIOS 143 IMAP 144 NEWS 443 SSL 445 SMB 458 QUICK TIME TV 545 QUICKTIME 548 AFP 554 Real Time Streaming Protocol 1080 SOCKS 1227 DNS2GO 1433 Microsoft SQL Server 1434 Microsoft SQL Monitor 1494 Citrix ICA Protocol 1521 ORACLE SQL 1604 Citrix ICA, MS Terminal Server 1723 PPTP CONTROL PORT 1755 WINDOWS MEDIA .ASF 1758 TFTP MULTICAST 3306 MYSQL 3389 RDP Protocol (Terminal Server) 4000 ICQ 5010 Yahoo! Messenger 5190 AIM 5631 PCAnywhere data 5632 PCAnywhere 5800,5801,5900,5901 VNC 6000 X WINDOWS 6667 IRC 7007 MSBD, Windows Media encoder 7070 RealServer/QuickTime 8383 IMAIL 26000 Quake 27001 QuakeWorld 27010 Half-Life 27015 Half-Life 27960 QuakeIII
计算机本地端口分析
基本端口的用途
TCP 1=TCP Port Service MultiplexerTCP 2=DeathTCP 5=Remote Job Entry,yoyoTCP 7=EchoTCP 11=SkunTCP 12=BomberTCP 16=SkunTCP 17=SkunTCP 18=消息传输协议,skunTCP 19=SkunTCP 20=FTP Data,AmandaTCP 21=文件传输,Back Construction,Blade Runner,Doly Trojan,Fore,FTP trojan,Invisible FTP,Larva, WebEx,WinCrashTCP 22=远程登录协议
TCP 23=远程登录(Telnet),Tiny Telnet Server (= TTS)
TCP 25=电子邮件(SMTP),Ajan,Antigen,Email Password Sender,Happy 99,Kuang2,ProMail trojan,Shtrilitz,Stealth,Tapiras,Terminator,WinPC,WinSpy,Haebu CocedaTCP 27=AssasinTCP 28=AmandaTCP 29=MSG ICPTCP 30=Agent 40421TCP 31=Agent 31,Hackers Paradise,Masters Paradise,Agent 40421TCP 37=Time,ADM wormTCP 39=SubSARITCP 41=DeepThroat,ForeplayTCP 42=Host Name ServerTCP 43=WHOISTCP 44=ArcticTCP 48=DRATTCP 49=主机登录协议
TCP 50=DRAT
TCP 51=Fuck Lamers BackdoorTCP 52=MuSka52,SkunTCP 53=DNS,Bonk (DOS Exploit)TCP 54=MuSka52TCP 58=DMSetupTCP 59=DMSetupTCP 66=AL-BarekiTCP 69=W32.Evala.Worm,BackGate Kit,Nimda,Pasana,Storm,Storm worm,TheefTCP 70=Gopher服务,ADM wormTCP 79=用户查询(Finger),Firehotcker,ADM wormTCP 80=超文本服务器(Http),Executor,RingZeroTCP 81=ChuboTCP 99=Hidden PortTCP 108=SNA网关访问服务器
TCP 109=Pop2
TCP 110=电子邮件(Pop3),ProMailTCP 113=Kazimas, Auther IdnetTCP 115=简单文件传输协议
TCP 118=SQL Services, Infector 1.4.2
TCP 119=Newsgroup(Nntp), Happy 99TCP 121=JammerKiller, Bo jammerkillahTCP 129=Password Generator ProtocolTCP 123=Net ControllerTCP 133=Infector 1.x//TCP 135=Netbios Remote procedure call//TCP 137=Netbios name (DoS attacks)//TCP 138=Netbios datagram //TCP 139=Netbios session (DoS attacks)TCP 143=IMAPTCP 146=FC Infector,InfectorTCP 150=NetBIOS Session ServiceTCP 156=SQL服务器
TCP 161=Snmp
TCP 162=Snmp-TrapTCP 170=A-TrojanTCP 179=Border网关协议(BGP)TCP 190=网关访问控制协议(GACP)TCP 194=IrcTCP 197=目录定位服务(DLS)TCP 256=NirvanaTCP 315=The InvasorTCP 389=Lightweight Directory Access Protocol (LDAP)TCP 396=Novell Netware over IPTCP 420=BreachTCP 421=TCP WrappersTCP 443=安全服务
TCP 444=Simple Network Paging Protocol(SNPP)
TCP 445=Microsoft-DSTCP 456=Hackers paradise,FuseSparkTCP 458=苹果公司QuickTimeTCP 531=RasminTCP 546=DHCP ClientTCP 547=DHCP ServerTCP 555=Ini-Killer,Phase Zero,Stealth SpyTCP 569=MSNTCP 605=SecretServiceTCP 606=Noknok8TCP 661=Noknok8TCP 666=Attack FTP,Satanz Backdoor,Back Construction,Dark Connection Inside 1.2TCP 667=Noknok7.2TCP 668=Noknok6TCP 692=GayOLTCP 777=AIM SpyTCP 808=RemoteControl,WinHoleTCP 815=Everyone DarlingTCP 901=Backdoor.DevilTCP 911=Dark ShadowTCP 999=DeepThroatTCP 1000=Der SpaeherTCP 1001=Silencer,WebEx,Der SpaeherTCP 1003=BackDoorTCP 1010=DolyTCP 1011=DolyTCP 1012=DolyTCP 1015=DolyTCP 1020=VampireTCP 1024=NetSpy.698(YAI)已知的一些扩展端口
TCP 1025=NetSpy.698TCP 1033=NetspyTCP 1042=BlaTCP 1045=RasminTCP 1047=GateCrasherTCP 1050=MiniCommandTCP 1080=WingateTCP 1090=Xtreme, VDOLiveTCP 1095=RatTCP 1097=RatTCP 1098=RatTCP 1099=RatTCP 1111=Backdoor.AIMVisionTCP 1170=Psyber Stream Server,Streaming Audio trojan,VoiceTCP 1200=NoBackOTCP 1201=NoBackOTCP 1207=SoftwarTCP 1212=Nirvana,Visul KillerTCP 1234=UltorsTCP 1243=BackDoor-G, SubSeven, SubSeven ApocalypseTCP 1245=VooDoo DollTCP 1269=Mavericks MatrixTCP 1313=NirvanaTCP 1349=BioNetTCP 1441=Remote StormTCP 1492=FTP99CMP(BackOriffice.FTP)TCP 1509=Psyber Streaming ServerTCP 1600=Shivka-BurkaTCP 1703=Exloiter 1.1TCP 1807=SpySenderTCP 1966=Fake FTP 2000TCP 1976=Custom portTCP 1981=ShockraveTCP 1999=BackDoor, TransScoutTCP 2000=Der Spaeher,INsane NetworkTCP 2001=Transmisson scoutTCP 2002=Transmisson scoutTCP 2003=Transmisson scoutTCP 2004=Transmisson scoutTCP 2005=TTransmisson scoutTCP 2023=Ripper,Pass Ripper,Hack City Ripper ProTCP 2115=BugsTCP 2121=NirvanaTCP 2140=Deep Throat, The InvasorTCP 2155=NirvanaTCP 2208=RuXTCP 2255=Illusion MailerTCP 2283=HVL Rat5TCP 2300=PC ExplorerTCP 2311=Studio54TCP 2565=StrikerTCP 2583=WinCrashTCP 2600=Digital RootBeerTCP 2716=Prayer TrojanTCP 2801=Phineas PhuckerTCP 2989=RatTCP 3024=WinCrash trojanTCP 3128=RingZeroTCP 3129=Masters ParadiseTCP 3150=Deep Throat, The InvasorTCP 3210=SchoolBusTCP 3456=TerrorTCP 3459=Eclipse 2000TCP 3700=Portal of DoomTCP 3791=EclypseTCP 3801=EclypseTCP 4000=腾讯客户端
TCP 4092=WinCrash
TCP 4242=VHMTCP 4321=BoBoTCP 4444=Prosiak,Swift remoteTCP 4500=W32.HLLW.TufasTCP 4567=File NailTCP 4590=ICQTrojanTCP 4950=ICQTrojanTCP 5000=WindowsXP服务器,Blazer 5,Bubbel,Back Door Setup,Sockets de TroieTCP 5001=Back Door Setup, Sockets de TroieTCP 5011=One of the Last Trojans (OOTLT)TCP 5031=Firehotcker,Metropolitan,NetMetroTCP 5032=MetropolitanTCP 5190=ICQ QueryTCP 5321=FirehotckerTCP 5333=Backage Trojan Box 3TCP 5343=WCratTCP 5400=Blade Runner, BackConstruction1.2TCP 5401=Blade Runner,Back ConstructionTCP 5402=Blade Runner,Back ConstructionTCP 5471=WinCrashTCP 5521=Illusion MailerTCP 5550=Xtcp,INsane NetworkTCP 5555=ServeMeTCP 5556=BO FacilTCP 5557=BO FacilTCP 5569=Robo-HackTCP 5598=BackDoor 2.03TCP 5631=PCAnyWhere dataTCP 5637=PC CrasherTCP 5638=PC CrasherTCP 5698=BackDoorTCP 5714=Wincrash3TCP 5741=WinCrash3TCP 5742=WinCrashTCP 5881=Y3K RATTCP 5882=Y3K RATTCP 5888=Y3K RATTCP 5889=Y3K RATTCP 5900=WinVnc,华讯VGA广播服务器
TCP 6000=Backdoor.AB
TCP 6006=Noknok8TCP 6272=SecretServiceTCP 6267=广外女生
TCP 6400=Backdoor.AB,The Thing
TCP 6500=Devil 1.03TCP 6661=TemanTCP 6666=TCPshell.cTCP 6667=NT Remote Control,华讯视频接收端口
TCP 6668=华讯视频广播服务器
TCP 6669=Vampyre
TCP 6670=DeepThroatTCP 6711=SubSevenTCP 6712=SubSeven1.xTCP 6713=SubSevenTCP 6723=MstreamTCP 6767=NT Remote ControlTCP 6771=DeepThroatTCP 6776=BackDoor-G,SubSeven,2000 CracksTCP 6789=Doly TrojanTCP 6838=MstreamTCP 6883=DeltaSourceTCP 6912=Shit HeepTCP 6939=IndoctrinationTCP 6969=GateCrasher, Priority, IRC 3TCP 6970=GateCrasherTCP 7000=Remote Grab,NetMonitor,SubSeven1.xTCP 7001=Freak88TCP 7201=NetMonitorTCP 7215=BackDoor-G, SubSevenTCP 7001=Freak88,Freak2kTCP 7300=NetMonitorTCP 7301=NetMonitorTCP 7306=NetMonitorTCP 7307=NetMonitor, ProcSpyTCP 7308=NetMonitor, X SpyTCP 7323=Sygate服务器端
TCP 7424=Host Control
TCP 7597=QazTCP 7609=Snid X2TCP 7626=冰河
TCP 7777=The Thing
TCP 7789=Back Door Setup, ICQKillerTCP 7983=MstreamTCP 8000=XDMA, 腾讯OICQ服务器端
TCP 8010=Logfile
TCP 8080=WWW 代理,Ring Zero,ChuboTCP 8520=W32.Socay.WormTCP 8787=BackOfrice 2000TCP 8897=Hack Office,ArmageddonTCP 8989=ReconTCP 9000=NetministratorTCP 9325=MstreamTCP 9400=InCommandTCP 9401=InCommandTCP 9402=InCommandTCP 9872=Portal of DoomTCP 9873=Portal of DoomTCP 9874=Portal of DoomTCP 9875=Portal of DoomTCP 9876=Cyber AttackerTCP 9878=TransScoutTCP 9989=Ini-KillerTCP 9999=Prayer TrojanTCP 10067=Portal of DoomTCP 10084=SyphillisTCP 10085=SyphillisTCP 10086=SyphillisTCP 10101=BrainSpyTCP 10167=Portal Of DoomTCP 10520=Acid ShiversTCP 10607=Coma trojanTCP 10666=AmbushTCP 11000=Senna SpyTCP 11050=Host ControlTCP 11051=Host ControlTCP 11223=Progenic,Hack 99KeyLoggerTCP 11831=TROJ_LATINUS.SVRTCP 12076=Gjamer, MSH.104bTCP 12223=Hack?9 KeyLoggerTCP 12345=GabanBus, NetBus, Pie Bill Gates, X-billTCP 12346=GabanBus, NetBus, X-billTCP 12349=BioNetTCP 12361=Whack-a-moleTCP 12362=Whack-a-moleTCP 12378=W32/Gibe@MMTCP 12456=NetBusTCP 12623=DUN ControlTCP 12624=ButtmanTCP 12631=WhackJob, WhackJob.NB1.7TCP 12701=Eclipse2000TCP 12754=MstreamTCP 13000=Senna SpyTCP 13010=Hacker BrazilTCP 13013=PsychwardTCP 13700=Kuang2 The VirusTCP 14456=SoleroTCP 14500=PC InvaderTCP 14501=PC InvaderTCP 14502=PC InvaderTCP 14503=PC InvaderTCP 15000=NetDaemon 1.0TCP 15092=Host ControlTCP 15104=MstreamTCP 16484=MosuckerTCP 16660=Stacheldraht (DDoS)TCP 16772=ICQ RevengeTCP 16969=PriorityTCP 17166=MosaicTCP 17300=Kuang2 The VirusTCP 17490=CrazyNetTCP 17500=CrazyNetTCP 17569=Infector 1.4.x + 1.6.xTCP 17777=NephronTCP 18753=Shaft (DDoS)TCP 19864=ICQ RevengeTCP 20000=Millennium II (GrilFriend)TCP 20001=Millennium II (GrilFriend)TCP 20002=AcidkoRTCP 20034=NetBus 2 ProTCP 20203=Logged,ChupacabraTCP 20331=BlaTCP 20432=Shaft (DDoS)TCP 21544=Schwindler 1.82,GirlFriendTCP 21554=Schwindler 1.82,GirlFriend,Exloiter 1.0.1.2TCP 22222=Prosiak,RuX Uploader 2.0TCP 22784=Backdoor.IntruzzoTCP 23432=Asylum 0.1.3TCP 23456=Evil FTP, Ugly FTP, WhackJobTCP 23476=Donald DickTCP 23477=Donald DickTCP 23777=INet SpyTCP 26274=DeltaTCP 26681=Spy VoiceTCP 27374=Sub Seven 2.0+, Backdoor.BasteTCP 27444=Tribal Flood Network,TrinooTCP 27665=Tribal Flood Network,TrinooTCP 29431=Hack AttackTCP 29432=Hack AttackTCP 29104=Host ControlTCP 29559=TROJ_LATINUS.SVRTCP 29891=The UnexplainedTCP 30001=Terr0r32TCP 30003=Death,Lamers DeathTCP 30029=AOL trojanTCP 30100=NetSphere 1.27a,NetSphere 1.31TCP 30101=NetSphere 1.31,NetSphere 1.27aTCP 30102=NetSphere 1.27a,NetSphere 1.31TCP 30103=NetSphere 1.31TCP NetSphere FinalTCP 30303=Sockets de TroieTCP 30947=IntruseTCP 30999=Kuang2TCP 21335=Tribal Flood Network,TrinooTCP 31336=Bo WhackTCP 31337=Baron Night,BO client,BO2,Bo Facil,BackFire,Back Orifice,DeepBO,Freak2k,NetSpyTCP 31338=NetSpy,Back Orifice,DeepBOTCP 31339=NetSpy DKTCP 31554=SchwindlerTCP 31666=BOWhackTCP 31778=Hack AttackTCP 31785=Hack AttackTCP 31787=Hack AttackTCP 31789=Hack AttackTCP 31791=Hack AttackTCP 31792=Hack AttackTCP 32100=PeanutBrittleTCP 32418=Acid BatteryTCP 33333=Prosiak,Blakharaz 1.0TCP 33577=Son Of PsychwardTCP 33777=Son Of PsychwardTCP 33911=Spirit 2001aTCP 34324=BigGluck,TN,Tiny Telnet ServerTCP 34555=Trin00 (Windows) (DDoS)TCP 35555=Trin00 (Windows) (DDoS)TCP 36794=Worm.Bugbear-ATCP 37651=YATTCP 40412=The SpyTCP 40421=Agent 40421,Masters Paradise.96TCP 40422=Masters ParadiseTCP 40423=Masters Paradise.97TCP 40425=Masters ParadiseTCP 40426=Masters Paradise 3.xTCP 41666=Remote BootTCP 43210=Schoolbus 1.6/2.0TCP 44444=Delta SourceTCP 47252=ProsiakTCP 47262=DeltaTCP 47878=BirdSpy2TCP 49301=Online KeyloggerTCP 50505=Sockets de TroieTCP 50766=Fore, SchwindlerTCP 51966=CafeIniTCP 53001=Remote Windows ShutdownTCP 53217=Acid Battery 2000TCP 54283=Back Door-G, Sub7TCP 54320=Back Orifice 2000,SheepTCP 54321=School Bus .69-1.11,Sheep, BO2KTCP 57341=NetRaiderTCP 58008=BackDoor.TronTCP 58009=BackDoor.TronTCP 58339=ButtFunnelTCP 59211=BackDoor.DuckToyTCP 60000=Deep ThroatTCP 60068=Xzip TCP 60411=ConnectionTCP 60606=TROJ_BCKDOR.G2.ATCP 61466=TelecommandoTCP 61603=Bunker-killTCP 63485=Bunker-killTCP 65000=Devil, DDoSTCP 65432=Th3tr41t0r, The TraitorTCP 65530=TROJ_WINMITE.10TCP 65535=RC,Adore Worm/LinuxTCP 69123=ShitHeepTCP 88798=Armageddon,Hack OfficeUDP 1=Sockets des TroieUDP 9=ChargenUDP 19=ChargenUDP 69=PasanaUDP 80=PenroxUDP 135=Netbios Remote procedure callUDP 137=Netbios name (DoS attacks)UDP 138=Netbios datagram UDP 139=Netbios session (DoS attacks)UDP 146=InfectorUDP 1025=Mavericks Matrix 1.2 - 2.0UDP 1026=Remote Explorer 2000UDP 1027=Trojan.Huigezi.eUDP 1028=KiLo,SubSARIUDP 1029=SubSARIUDP 1031=XotUDP 1032=Akosch4UDP 1104=RexxRaveUDP 1111=DaodanUDP 1116=LurkerUDP 1122=Last 2000,SingularityUDP 1183=Cyn,SweetHeartUDP 1200=NoBackOUDP 1201=NoBackOUDP 1342=BLA trojanUDP 1344=PtakksUDP 1349=BO dllUDP 1561=MuSka52UDP 1772=NetControleUDP 1978=SlapperUDP 1985=Black DiverUDP 2000=A-trojan,Fear,Force,GOTHIC Intruder,Last 2000,Real 2000UDP 2001=ScalperUDP 2002=SlapperUDP 2130=Mini BackLashUDP 2140=Deep Throat,Foreplay,The InvasorUDP 2222=SweetHeart, WayUDP 2339=Voice SpyUDP 2702=Black DiverUDP 2989=RATUDP 3150=Deep ThroatUDP 3215=XHXUDP 3333=DaodanUDP 3801=EclypseUDP 3996=Remote AnythingUDP 4128=RedShadUDP 4156=SlapperUDP 5419=DarkSkyUDP 5503=Remote Shell TrojanUDP 5555=DaodanUDP 5882=Y3K RATUDP 5888=Y3K RATUDP 6112=Battle.net GameUDP 6666=KiLoUDP 6667=KiLoUDP 6766=KiLoUDP 6767=KiLo,UandMeUDP 6838=Mstream Agent-handlerUDP 7028=未知木马
UDP 7424=Host Control
UDP 7788=SingularityUDP 7983=MStream handler-agentUDP 8012=PtakksUDP 8090=Aphexs Remote Packet SnifferUDP 8127=9_119,ChonkerUDP 8488=KiLoUDP 8489=KiLoUDP 8787=BackOrifice 2000UDP 8879=BackOrifice 2000UDP 9325=MStream Agent-handlerUDP 10000=XHXUDP 10067=Portal of DoomUDP 10084=SyphillisUDP 10100=SlapperUDP 10167=Portal of DoomUDP 10498=MstreamUDP 10666=AmbushUDP 11225=CynUDP 12321=ProtossUDP 12345=BlueIce 2000UDP 12378=W32/Gibe@MMUDP 12623=ButtMan,DUN ControlUDP 15210=UDP remote shell backdoor serverUDP 15486=KiLoUDP 16514=KiLoUDP 16515=KiLoUDP 18753=Shaft handler to AgentUDP 20433=ShaftUDP 21554=GirlFriendUDP 22784=Backdoor.IntruzzoUDP 23476=Donald DickUDP 25123=MOTDUDP 26274=Delta SourceUDP 26374=Sub-7 2.1UDP 26444=Trin00/TFN2KUDP 26573=Sub-7 2.1UDP 27184=Alvgus trojan 2000UDP 27444=TrinooUDP 29589=KiLoUDP 29891=The UnexplainedUDP 30103=NetSphereUDP 31320=Little WitchUDP 31335=Trin00 DoS AttackUDP 31337=Baron Night, BO client, BO2, Bo Facil, BackFire, Back Orifice, DeepBOUDP 31338=Back Orifice, NetSpy DK, DeepBOUDP 31339=Little WitchUDP 31340=Little WitchUDP 31416=LithiumUDP 31787=Hack aTackUDP 31789=Hack aTackUDP 31790=Hack aTackUDP 31791=Hack aTackUDP 33390=未知木马
UDP 34555=Trinoo
UDP 35555=TrinooUDP 43720=KiLoUDP 44014=IaniUDP 44767=School BusUDP 46666=TaskmanUDP 47262=Delta SourceUDP 47785=KiLoUDP 49301=OnLine keyLoggerUDP 49683=FensterUDP 49698=KiLoUDP 52901=OmegaUDP 54320=Back OrificeUDP 54321=Back Orifice 2000UDP 54341=NetRaider TrojanUDP 61746=KiLOUDP 61747=KiLOUDP 61748=KiLOUDP 65432=The Traitor