Case netstat -ano, list all ports: Enter the cmd command window command
netstat -aon | find "135", enter, write down the last digit, ie PID, here is 972.
Continue to enter tasklist | find "972", Enter, see which program or process takes up 972 port, the results are: svchost.exe
The end of the process: taskkill / f / t / im svchost.exe
(PID number can directly end: taskkill / pid 972 / f)
Test whether to open a port
Enter the command cmd command window: start / min telnet 192.168.3.42 8080
appears after a window is minimized, you later on, if the window is automatically closed, indicating port is closed or not ping a host, and vice versa port open.
netstat -anp tcp can see what the current host tcp open port.
netstat -anp tcp 80 can view the current host tcp80 port.