How to check if a port is occupied by a program in Windows

Source: Http://blog.chinaunix.net/u2/88533/showart_1815741.html Sometimes installProgramThe XX port is occupied. You can run the CMD command to check which program is occupied. 1. view the PID of the program corresponding to the port in netstat-ano, for example, C: \> netstat-anoactive connectionsproto local address.   Foreign address   State   PID TCP   0.0.0.0: 135   0.0.0.0: 0   Listening   1760 TCP   0.0.0.0: 445   0.0.0.0: 0   Listening   4 TCP   0.0.0.0: 2967   0.0.0.0: 0   Listening   660 TCP   0.0.0.0: 3389   0.0.0.0: 0   Listening   1712 TCP   0.0.0.0: 3934   0.0.0.0: 0   Listening   728 TCP   0.0.0.0: 10700   0.0.0.0: 0   Listening   4920 TCP   10.186.20.116: 21      0.0.0.0: 0