Greetings, My asp.net mvc application calls WCF service. Everything is ok on my localhost (WinXP, IIS6). When I moved on production server where Win2008 Server and IIS7 are used my application gets authorization error while connecting to WCF service. ASP.NET MVC works ok but when it calls some methods on my WCF Service an error is thrown. The funny thing is that when I call the same WCF Production service from the same ASP.NET MVC application hosted on my localhost it works ok. Can someone please help me with this. I think it's authorization problem which can be fixed on IIS7. Am I right?