Telnet untuk menguji port dalam kondisi terbuka atau tertutup

Contoh di sistem operasi windows :

  • Jalankan CMD (Command Prompt) dengan mode Administrator
  • perintah telnet [domainname or ip] [port] 
    contoh : “telnet 192.168.1.1 80”
    contoh : “telnet masteknisi.com 443”
  • If the connection succeeds, a blank screen will show up, meaning that the computer port is open.
    A failed connection will be accompanied by an error message. It can indicate either a closed port or the fact that the indicated remote server is not listening on the provided port.

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