getting error 12007 from httpSendRequest ApI function

[Mishi Abolghasem]

I'm trying to use this sequence of VB-API calls to post to a web-page where
client certificate is required.(
InternetOpen,InternetConnect,HttpOpenRequest,HttpS endRequest) And then
InternetReadFile to save Page on local machine.

InternetConnect works fine with URL which are not protected by digital
certificate and Password, but when I try to access a URL where Digital
certificate and UserId and Password is required it gives me problem.
When I do HttpSendRequest , it returns Err.LastDllError=12007(Server name
could not be resolved)
Digital certificate is provided by server admin on my machine.

Here is the code I'm using:

hOpen = InternetOpen("httpGetFile", INTERNET_OPEN_TYPE_PRECONFIG,
vbNullString, vbNullString, 0)
hConnect = InternetConnect(hOpen, sUrl, INTERNET_DEFAULT_HTTPS_PORT, sUID,
sPWD, INTERNET_SERVICE_HTTP, 0, 0)
hRequest = HttpOpenRequest(hConnect, "post", sURL1, "HTTP/1.0",
vbNullString, vbNullString, INTERNET_FLAG_SECURE, 0)
bRes = HttpSendRequest(hRequest, vbNullString, 0, "mystirng", 0)

does any body know the problem?
thanks
Mishi