Upload files from VB with WININET Error!

Good day to all. I have a problem using WinInet to upload a file to a web server. I get error 87 when I try to execute HTTPsendRequesstEX. I'm using sendRequestEX as I need Async communications.

I have a valid internet File Handle and there are no permissions issues on the server (IIS is installed on my laptop).

Here is the code snippet:

**** START OF SNIPPET ****

hRequest = HttpOpenRequest(hConnect, "PUT", "/filer/test.txt", vbNullString, vbNullString, 0, INTERNET_FLAG_NO_CACHE_WRITE, 0)
Rem *** All GOOD to here. at this point I have a valid connection to the server and logged in with an appropriate account.
Rem *** hConnect paramater is returned by a previous function to return a Valid connection handle to the server.

' This is the way it Must be called.
'BOOL HttpSendRequestEx(
' HINTERNET hRequest, -> Handle returned by HttpOpenRequest.
' LPINTERNET_BUFFERS lpBuffersIn, Optional. ->Pointer to an INTERNET_BUFFERS structure
' LPINTERNET_BUFFERS lpBuffersOut, Optional. ->Pointer to an INTERNET_BUFFERS structure
' DWORD dwFlags, ->reserved and MUST be set to zero
' DWORD dwContext ->Application-defined context value
');

Status = HttpSendRequestEx(hRequest, IB, vbNull, 0, 0) ' THISS CAUSES THE ERROR
If Status = 0 Then ' HERE IS WHERE I CATCH THE ERROR
MsgBox ("HttpSendRequestEx Err: " & Err.LastDllError)
Unload Me
End
End If

**** END OF SNIPPET ****


I have already developed FILE DOWNLOAD code (which is extremely fast -> 80 mb in about 2 minutes). I need to have an UPLOAD FILE piece for a project that I am working on in-house.

Any help would be greatly appreciated.

Thanks

Goomba
ps: please feel free to email me directly at: rgutery@mentorits.com