Hello Jeff，

我不确定您的情况如何.可能是您的WCF服务无法访问SQL Server实例.

请尝试本文中给出的步骤，

Hello Jeff,

I am not sure whats happening in your scenario. May be your WCF service dose not have access to SQL server instance.

Please try the steps given in this article,

http://www.codeplex.com/WCFSecurity/Wiki/View.aspx?title=How To - Use SQL Role Provider with Windows Authentication in WCF calling from Windows Forms&referringTitle=How Tos

Hope this will work for you.

Thanks,
Jay