Identifying open ports on servers requires the port to be opened and unnecessary services to be disabled or shutdown. The server should have a minimal operating system configuration.
For Windows, run the following command using the Command Prompt:
netstat -a | findstr "LISTEN"
The ouptu of the preceding command is as shown in the screenshot:
For Linux/Unix, run the following command using the shell prompt:
netstat -antp | grep "LISTEN"
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