AW: ntlm Auth , getting "Unable to respond to any of these challenges: {negotiate=Negotiate}"

Calling the WS-URI with curl I get:

"HTTP/1.1 401 Unauthorized
Content-Length: 0
Server: Microsoft-HTTPAPI/2.0
WWW-Authenticate: Negotiate
Date: Fri, 19 Oct 2012 09:46:53 GMT

HTTP/1.1 401 Unauthorized
Content-Length: 0
Server: Microsoft-HTTPAPI/2.0
WWW-Authenticate: Negotiate
Date: Fri, 19 Oct 2012 09:46:53 GMT

HTTP/1.1 401 Unauthorized
Content-Length: 0
Server: Microsoft-HTTPAPI/2.0
WWW-Authenticate: Negotiate
Date: Fri, 19 Oct 2012 09:46:53 GMT
..."

And finally

"curl: (47) Maximum (50) redirects followed"

-----Ursprüngliche Nachricht-----
Von: Clemens Wyss DEV [mailto:[email protected]] 
Gesendet: Freitag, 19. Oktober 2012 11:46
An: [email protected]
Betreff: ntlm Auth , getting "Unable to respond to any of these challenges: {negotiate=Negotiate}"

Doing ntlm authentication to access a .NET Webservice. 
Unfortunately I am getting:
Unable to respond to any of these challenges: {negotiate=Negotiate}

When I access the site/uri with the browser (safari) I am getting the login-Dialog to authenticate and can then access the webservice.

My auth-code looks alike

...
final NTCredentials ntCredentials = new NTCredentials( "<uid>", "<pw>", "", "<domain>" ); final CredentialsProvider ntCredentialsProvider = new CredentialsProvider() {
	public Credentials getCredentials(final AuthScheme scheme, final String host, int port, boolean proxy) throws CredentialsNotAvailableException {
		return ntCredentials;
	}
};
DefaultHttpParams.getDefaultParams().setParameter( "http.authentication.credential-provider", ntCredentialsProvider ); ...

Also trying to force NTML-only (in order to omit negotiation) fails:
...
// force NTLM
DefaultHttpParams.getDefaultParams().setParameter( "http.protocol.handle-authentication", false ); List<String> authpref = new ArrayList<String>(); authpref.add( AuthPolicy.NTLM ); DefaultHttpParams.getDefaultParams().setParameter( "http.auth.target-scheme-pref", authpref );
DefaultHttpParams.getDefaultParams().setParameter( "http.auth.proxy-scheme-pref", authpref );        
...

It used to work before the endpoint was moved to another host. There I would/did see (in the log/console):
- ntlm authentication scheme selected

What can I do to narrow down this problem?

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