On Wed, 14 Sep 2011, Mark Schienbein wrote:

Please don't top-post.

> My first attempt did not include the TUNNEL option. When I did the original
> test (without the TUNNEL option) I simply received a zero retrun code from
> the PERFORM. My read callback routine was never invoked (thus nothing was
> sent to the FTP site). This is why I tried the TUNNEL option. It was not
> until I added the TUNNEL option that my read "callback" routine was actually
> invoked by libcurl -- but then the return code indicated the write error.

What libcurl version is this?

Can you show us your CURLOPT_VERBOSE output? (edit out any sensitive pieces)

-- 
  / daniel.haxx.se
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