Error 12032 on httpendrequest

[bdanie...@yahoo.com]

I am using a VC++ DLL to upload files from a client to a server using
WinInet API calls, using httpSendRequestEx. Occasionally and
mysteriously I will get Error code 12032 on HttpEndRequest. I have
researched this error code and the standard explanations and "fixes"
for it do not apply to my situation. I am using anonymous access on the
web site, so the user name and password do not have to be passed to
IIS. I have code in place that will attempt to re-upload any file that
has an error up to ten times before failing. Even with this in place, I
sometimes still getting the error 12032, meaning it failed ten times in
a row. Note that this code usually works, but sometimes it fails and I
want to know why it is failing.

When I get this error, usually it takes a complete reboot of my system
to make it go away. Restarting IIS will not make it go away. I would
like to know why I am getting this error, and why I have to reboot to
make it go away. I want to understand what is happening on a low
level. Can someone explain this to me?

A few more details:

I am using Windows XP SP2/IIS 5.
In this case, the client and server were on the same PC.

If I have not provided enough detail about the problem, ask me whatever
you like.

[bdanie...@yahoo.com]

This morning I received the 12032 error again on HttpEndRequest, but
this time I did not have to reboot the computer to correct it. I only
had to close IE 7, open a new instance of IE 7, re-attempt the upload,
and it worked. The fact that it did work after me doing that and did
not work before tells me there is nothing wrong with the setup on the
client or server, but that there was some temporary condition that
existed the first time to cause the error message. I have no idea what
this temporary condition is.

I find it hard to believe that nobody has an answer to this. Will
someone take the time to assist me with this?