Support,

We seem to be experiencing some difficulties in getting libcurl to work with NTLM and Kerberos authentication on a windows platform. Any help would be greatly appreciated.

Here is the problem:

We have a site configured to use NTLM Negotiate authentication mechanism (also tried Kerberos instead of NTLM). When I call the URL in the browser while monitoring the traffic in Fiddler, the negotiate authentication works as expected: first two requests return 401 and the third one returns 200.

[cid:image001.jpg_at_01D0E59E.4E613010]

However, when I try to make the same call using cURL, the negotiation never happens, only one request is made and 401 status is returned:

[cid:image002.jpg_at_01D0E59E.4E613010]

I tried a setting this optionin cURL before making the call:
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_GSSNEGOTIATE)

Also, tried setting it this way:
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_GSSNEGOTIATE | CURLAUTH_NTLM)

And this way:
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY)

The result is always the same - one request returning 401. The second (and sometimes third) negotiations never seem to happen. What are we doing/not doing correctly?

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