How do I blind my program to a port

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C++

i am trying to make away that i can connect to my computer using port 2020. i made the login but i need to blind it to the port so when i login it will give me access to cmd on my computer, from my other computer in my office.

#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;

int main()
{
	system("COLOR 1E");
	string userName;
	string userPassword;
	int loginAttempt = 0;

	while (loginAttempt < 5)
	{
		system("CLS");
		cout << "Please enter your user name: ";
		cin >> userName;
		cout << "Please enter your user password: ";
		cin >> userPassword;

		if (userName == "test" && userPassword == "test")
		{
			system("CLS");
			cout << "Welcome Wolf!\n";
			break;
			system("PAUSE");
		}
		else
		{
			system("CLS");
			cout << "Invalid login attempt. Please try again.\n" << '\n';
			loginAttempt++;
			system("PAUSE");
		}
	}
	if (loginAttempt == 5)
	{
		system("CLS");
		cout << "Too many login attempts!";
		system("PAUSE");
	}
	system("PAUSE");
	return 0;
}

What I have tried:

i try finding a way online and i could not get the info i am after. ps. i have only started programing in C++. so i am not good at it.