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exchangewebservices - Could not establish the connection to the Exchange Web Service - Java API

I am testing the Microsoft Exchange Web Service Java API (version 1.2) to read mails from a server. Here is my code:

String url = "https://my-server/EWS/exchange.asmx";
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
service.setTraceEnabled(true);
service.setCredentials(new WebCredentials("user", "password"));
service.setUrl(url.toURI());

Mailbox mailbox = new Mailbox("foo@bar.com");
FolderId folder = new FolderId(WellKnownFolderName.Inbox, mailbox);
ItemView view = new ItemView(10);
view.getOrderBy().add(ItemSchema.DateTimeReceived, SortDirection.Descending);
FindItemsResults<Item> items = service.findItems(folder, view);

Unfortunately, this code throws the following error:

Exception in thread "main" microsoft.exchange.webservices.data.EWSHttpException: Connection not established
    at microsoft.exchange.webservices.data.HttpClientWebRequest.throwIfConnIsNull(Unknown Source)
    at microsoft.exchange.webservices.data.HttpClientWebRequest.getResponseCode(Unknown Source)
    at microsoft.exchange.webservices.data.EwsUtilities.formatHttpResponseHeaders(Unknown Source)
    at microsoft.exchange.webservices.data.ExchangeServiceBase.traceHttpResponseHeaders(Unknown Source)
    at microsoft.exchange.webservices.data.ExchangeServiceBase.processHttpResponseHeaders(Unknown Source)
    at microsoft.exchange.webservices.data.SimpleServiceRequestBase.internalExecute(Unknown Source)
    at microsoft.exchange.webservices.data.MultiResponseServiceRequest.execute(Unknown Source)
    at microsoft.exchange.webservices.data.ExchangeService.findItems(Unknown Source)
    at microsoft.exchange.webservices.data.ExchangeService.findItems(Unknown Source)
    at foo.bar.TestMail.main(TestMail.java:52)

I'm not able to understand what is wrong with the current code. Do you have any clue, or at least some tests to try?

Note that the web-service (https//my-server/exchange.asmx) is accessible to my Java code.

Not sure if it can help, but I've found that in the traces displayed by the logs:

<Trace Tag="EwsResponse" Tid="1" Time="2013-01-28 10:47:03Z">
<html><head><title>Error</title></head><body>The function requested is not supported
</body></html>
</Trace>

EDIT

I've made another test. This time, I use the defaults credentials - so my own email account - using service.setUseDefaultCredentials(true); instead of setting the WebCredentials object. The connection is still not established, but I get another error (I've took only the interesting part of the trace log):

<h1>You are not authorized to view this page</h1>
You do not have permission to view this directory or page using the credentials that you supplied because your Web browser is sending a WWW-Authenticate header field that the Web server is not configured to accept.
(...)
<h2>HTTP Error 401.2 - Unauthorized: Access is denied due to server configuration.<br>Internet Information Services (IIS)</h2>

Of course, I can't access nor change anything on the Exchange server side. Is there a way to make the authentication successful?

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The problem is due to the authentication scheme used. By default, EWS uses NTLM, but my Exchange server is not configured to accept this kind of authentication. I have to use LDAP authentication.


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