以解决80端口被占用为例。
第一步，用netstat指令查看是哪个进程占用了端口。
C:\Users\73936>netstat -aon|findstr 80
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4
TCP 0.0.0.0:1309 0.0.0.0:0 LISTENING 4080
TCP 0.0.0.0:7680 0.0.0.0:0 LISTENING 4752
TCP 192.168.3.6:1271 52.230.85.180:443 ESTABLISHED 4052
TCP 192.168.3.6:1435 180.149.145.241:80 LAST_ACK 3220
TCP 192.168.3.6:1514 52.230.85.180:443 ESTABLISHED 9760
TCP 192.168.3.6:1631 23.2.16.73:80 TIME_WAIT 0
TCP 192.168.3.6:1636 23.2.16.73:80 TIME_WAIT 0
TCP 192.168.3.6:1637 117.18.237.29:80 TIME_WAIT 0
TCP 192.168.3.6:1638 23.2.16.73:80 TIME_WAIT 0
TCP 192.168.3.6:1639 117.18.237.29:80 TIME_WAIT 0
TCP 192.168.3.6:1666 23.2.16.73:80 TIME_WAIT 0
TCP 192.168.3.6:1731 23.2.16.73:80 TIME_WAIT 0
TCP 192.168.3.6:1774 23.2.16.73:80 TIME_WAIT 0
TCP 192.168.3.6:1775 117.18.237.29:80 TIME_WAIT 0
TCP 192.168.3.6:1780 23.2.16.73:80 TIME_WAIT 0
TCP 192.168.3.6:1782 117.18.237.29:80 TIME_WAIT 0
TCP 192.168.3.6:1806 192.168.3.8:139 TIME_WAIT 0
TCP 192.168.3.6:1855 10.163.89.249:7680 SYN_SENT 4752
TCP 192.168.3.6:1856 10.163.89.249:7680 SYN_SENT 4752
TCP 192.168.3.6:1857 10.163.89.249:7680 SYN_SENT 4752
TCP [::]:80 [::]:0 LISTENING 4
TCP [::]:7680 [::]:0 LISTENING 4752
TCP [::1]:1680 [::]:0 LISTENING 7708
UDP [fe80::7423:d8cf:62a7:d11c%11]:1900 *:* 5832
UDP [fe80::7423:d8cf:62a7:d11c%11]:55121 *:* 5832
在第2列可以找到，占用80端口的进程号为4。一看这个数字这么小，我预料到会有不好的事情发生。
第二步，用tasklist指令查找进程号对应的名称。
C:\Users\73936>tasklist|findstr 4
System 4 Services 0 140 K
Registry 96 Services 0 45,792 K
smss.exe 348 Services 0 932 K
csrss.exe 504 Services 0 5,572 K
wininit.exe 628 Services 0 6,764 K
services.exe 676 Services 0 11,460 K
fontdrvhost.exe 892 Services 0 2,984 K
WUDFHost.exe 960 Services 0 7,084 K
svchost.exe 76 Services 0 15,364 K
svchost.exe 384 Services 0 8,516 K
svchost.exe 1268 Services 0 9,472 K
svchost.exe 1276 Services 0 11,428 K
svchost.exe 1404 Services 0 10,788 K
svchost.exe 1412 Services 0 15,492 K
svchost.exe 1480 Services 0 10,252 K
svchost.exe 1524 Services 0 18,240 K
svchost.exe 1664 Services 0 9,412 K
svchost.exe 1884 Services 0 7,360 K
svchost.exe 416 Services 0 23,116 K
svchost.exe 2040 Services 0 11,904 K
svchost.exe 2132 Services 0 9,384 K
svchost.exe 2220 Services 0 12,460 K
Memory Compression 2356 Services 0 74,120 K
igfxCUIService.exe 2408 Services 0 7,556 K
svchost.exe 2452 Services 0 7,640 K
svchost.exe 2460 Services 0 9,920 K
svchost.exe 2592 Services 0 12,744 K
svchost.exe 2676 Services 0 14,832 K
svchost.exe 2708 Services 0 8,244 K
svchost.exe 2724 Services 0 6,284 K
svchost.exe 2980 Services 0 17,624 K
svchost.exe 3052 Services 0 13,384 K
AsLdrSrv.exe 3064 Services 0 5,024 K
svchost.exe 2140 Services 0 21,828 K
spoolsv.exe 2792 Services 0 12,460 K
conhost.exe 3288 Services 0 4,644 K
svchost.exe 3464 Services 0 6,552 K
armsvc.exe 3472 Services 0 5,556 K
svchost.exe 3480 Services 0 8,612 K
CAJSHost.exe 3488 Services 0 4,972 K
svchost.exe 3496 Services 0 13,204 K
ASUSGiftBoxDesktop.exe 3504 Services 0 5,828 K
AGMService.exe 3544 Services 0 10,044 K
CxAudMsg64.exe 3552 Services 0 7,896 K
AGSService.exe 3560 Services 0 10,400 K
svchost.exe 3580 Services 0 22,724 K
esif_uf.exe 3620 Services 0 7,040 K
OfficeClickToRun.exe 3640 Services 0 38,700 K
Everything.exe 3704 Services 0 6,208 K
svchost.exe 3784 Services 0 9,020 K
EvtEng.exe 3792 Services 0 13,144 K
svchost.exe 3940 Services 0 11,972 K
RegSrvc.exe 4028 Services 0 8,844 K
svchost.exe 4036 Services 0 6,112 K
svchost.exe 4052 Services 0 20,304 K
jtagserver.exe 4080 Services 0 7,692 K
inetinfo.exe 3404 Services 0 10,136 K
ibtsiva.exe 4112 Services 0 4,236 K
FlashHelperService.exe 4132 Services 0 6,952 K
nvcontainer.exe 4140 Services 0 23,004 K
SecurityHealthService.exe 4148 Services 0 15,216 K
NVDisplay.Container.exe 4168 Services 0 9,772 K
SASrv.exe 4176 Services 0 5,332 K
RichVideo64.exe 4184 Services 0 6,388 K
IpOverUsbSvc.exe 4192 Services 0 11,944 K
QQProtect.exe 4200 Services 0 18,232 K
ZeroConfigService.exe 4224 Services 0 16,068 K
PEFService.exe 4276 Services 0 7,152 K
MsMpEng.exe 4288 Services 0 271,288 K
TeamViewer_Service.exe 4484 Services 0 10,712 K
IntelCpHeciSvc.exe 4564 Services 0 9,016 K
svchost.exe 4572 Services 0 8,652 K
svchost.exe 4664 Services 0 16,384 K
dasHost.exe 4772 Services 0 16,164 K
svchost.exe 5004 Services 0 11,316 K
svchost.exe 4316 Services 0 6,876 K
svchost.exe 3000 Services 0 9,476 K
svchost.exe 8684 Services 0 18,248 K
SearchIndexer.exe 9564 Services 0 44,328 K
svchost.exe 9824 Services 0 14,416 K
svchost.exe 10196 Services 0 9,864 K
svchost.exe 10632 Services 0 6,584 K
svchost.exe 10984 Services 0 18,968 K
svchost.exe 10416 Services 0 40,952 K
svchost.exe 4752 Services 0 17,896 K
sppsvc.exe 10840 Services 0 10,316 K
svchost.exe 8744 Services 0 8,340 K
isa.exe 12336 Services 0 8,348 K
svchost.exe 10792 Services 0 7,340 K
svchost.exe 12928 Services 0 8,704 K
audiodg.exe 10884 Services 0 15,952 K
svchost.exe 3756 Services 0 15,640 K
svchost.exe 9476 Services 0 7,144 K
svchost.exe 5944 Services 0 5,908 K
csrss.exe 15912 Console 8 5,844 K
fontdrvhost.exe 3180 Console 8 45,708 K
svchost.exe 15456 Services 0 23,256 K
svchost.exe 11416 Services 0 6,888 K
HControl.exe 10448 Console 8 9,840 K
nvcontainer.exe 7724 Console 8 27,948 K
sihost.exe 15544 Console 8 24,432 K
svchost.exe 8904 Console 8 33,212 K
taskhostw.exe 2852 Console 8 15,684 K
ACMON.exe 13096 Console 8 4,972 K
USBChargerPlus.exe 9140 Console 8 2,500 K
esif_assist_64.exe 3668 Console 8 3,784 K
svchost.exe 524 Services 0 6,956 K
ATKOSD2.exe 9388 Console 8 9,064 K
explorer.exe 8348 Console 8 137,184 K
ShellExperienceHost.exe 14040 Console 8 68,616 K
SearchUI.exe 6648 Console 8 129,324 K
RuntimeBroker.exe 14992 Console 8 20,872 K
RuntimeBroker.exe 6984 Console 8 22,732 K
SettingSyncHost.exe 12164 Console 8 12,420 K
RemindersServer.exe 1620 Console 8 13,428 K
ctfmon.exe 12840 Console 8 24,284 K
SkypeHost.exe 14628 Console 8 61,032 K
svchost.exe 14696 Services 0 7,952 K
RuntimeBroker.exe 6224 Console 8 21,064 K
ChsIME.exe 2260 Console 8 35,540 K
WindowsInternal.Composabl 7584 Console 8 45,392 K
conhost.exe 6204 Console 8 2,076 K
AsusHWCenter64.exe 11760 Console 8 2,684 K
CAudioFilterAgent64.exe 12528 Console 8 8,044 K
OneDrive.exe 9760 Console 8 46,208 K
rishiqing.exe 11640 Console 8 40,644 K
rishiqing.exe 4616 Console 8 106,120 K
rishiqing.exe 1208 Console 8 51,148 K
DictQuerySync.exe 7476 Console 8 13,256 K
Snipaste.exe 14848 Console 8 22,936 K
ONENOTEM.EXE 8484 Console 8 2,216 K
acrotray.exe 456 Console 8 8,004 K
Creative Cloud.exe 8040 Console 8 68,312 K
AdobeIPCBroker.exe 14096 Console 8 10,332 K
Adobe CEF Helper.exe 4536 Console 8 53,616 K
CoreSync.exe 612 Console 8 29,848 K
conhost.exe 10644 Console 8 8,492 K
Adobe CEF Helper.exe 8428 Console 8 48,856 K
svchost.exe 14024 Services 0 10,748 K
chrome.exe 3968 Console 8 380,460 K
chrome.exe 11848 Console 8 8,348 K
chrome.exe 8556 Console 8 40,676 K
chrome.exe 8156 Console 8 144,332 K
chrome.exe 1552 Console 8 48,872 K
chrome.exe 14224 Console 8 42,948 K
chrome.exe 11472 Console 8 40,564 K
chrome.exe 9292 Console 8 37,844 K
chrome.exe 12876 Console 8 46,252 K
steamcommunity_302_V5.exe 14396 Console 8 14,296 K
chrome.exe 1304 Console 8 129,660 K
chrome.exe 5040 Console 8 21,340 K
svchost.exe 9272 Services 0 22,484 K
UpdateChecker.exe 1564 Console 8 12,196 K
HxTsr.exe 16284 Console 8 39,156 K
findstr.exe 15284 Console 8 3,272 K
在以上这么多进程中，从第2列找到进程号为4的，发现是System。那就没有办法了，让它占着吧。这时我才意识到占用80端口的是Windows的Internet Information Service，要解决我这次80端口被占用看来只能关掉它。
当然上面出现的只是很少见的情况，大多数情况下我们会查到一个非系统进程。想要关掉这种进程，只需要在任务管理器中结束进程即可。
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