Determine which program uses or blocks a port



The Netstat.exe utility has a switch, that can display the process identifier (ID) that is associated with each connection to identify port conflicts. This information can be used to determine which process (program) listens on a given port.

Using Netstat command:

  1. Open a CMD prompt
  2. Type in the command: netstat -ano -p tcp
  3. You’ll get an output similar to this one
  4. Look-out for the TCP port in the Local Address list and note the corresponding PID number

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