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SharePoint Designer 2010 data sources that consume ListData.svc fail to generate a web part on sites that use NTLM authentication
Article ID: 2513432 - View products that this article applies to.
SharePoint Foundation 2010 has introduced a new REST interface to query SharePoint list data. This new interface can be consumed by SharePoint Designer.
Please refer to these links for more details.
If Windows authentication is configured and Kerberos is not then any DataFormWebParts that try to consume the data source will generate the following error message in SharePoint Designer:
Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator.
This is caused by double hop issues as outlined by in this article:
Configure the web application to use Kerberos as per this article on any server that ListData.svc is going to be used from:
Once this has been implemented the Windows authentication dialog box in the REST data source will function as intended.