Unable to get to get EveryConnectionCollection for Internet Connection Sharing - c++

Question

I am trying to use Microsoft's library in order to add port mapping to my ICS connection but I'm getting the "failed to get EveryConnectionCollection!\r\n" message. I am extremely new to C++ and I'm not sure where to start in order to try and get this working. I think I might need to initialize INetConnection * pNC = NULL; // fill this out for part 2 below but I'm not sure what needs to be filled out.
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <objbase.h>
#include <netcon.h>
#include <stdio.h>
#pragma comment(lib, "ole32.lib")
#pragma comment(lib, "oleaut32.lib")
// as in winsock.h
#define NAT_PROTOCOL_TCP 6
HRESULT DeletePortMapping(INetSharingManager* pNSM, UCHAR ucIPProtocol, short usExternalPort)
{
INetConnection* pNC = NULL; // fill this out for part 2 below
INetSharingEveryConnectionCollection* pNSECC = NULL;
HRESULT hr = pNSM->get_EnumEveryConnection(&pNSECC);
if (!pNSECC)
wprintf(L"failed to get EveryConnectionCollection!\r\n");
if (pNC == NULL) {
wprintf(L"failed to find a valid connection!\r\n");
return E_FAIL;
}
INetSharingConfiguration* pNSC = NULL;
hr = pNSM->get_INetSharingConfigurationForINetConnection(pNC, &pNSC);
pNC->Release(); // don't need this anymore
if (!pNSC) {
wprintf(L"can't make INetSharingConfiguration object!\r\n");
return hr;
}
}
int main()
{
CoInitialize(NULL);
// init security to enum RAS connections
CoInitializeSecurity(NULL, -1, NULL, NULL,
RPC_C_AUTHN_LEVEL_PKT,
RPC_C_IMP_LEVEL_IMPERSONATE,
NULL, EOAC_NONE, NULL);
INetSharingManager* pNSM = NULL;
HRESULT hr = ::CoCreateInstance(__uuidof(NetSharingManager),
NULL,
CLSCTX_ALL,
__uuidof(INetSharingManager),
(void**)&pNSM);
DeletePortMapping(pNSM, NAT_PROTOCOL_TCP, 555);
}