I am Writing a PHP application that needs to run a back end .NET application. When creating a running the WCF web service out of the box, the PHP could not connect to the web service.

The problem:

The PHP returns "Caught exception: Cannot process the message because the content type 'text/xml; charset=utf-8' was not the expected type 'application/soap+xml; charset=utf-8'."

The reason:

WCF is running a new version of web services than expected by the PHP.

The solution:

Change the binding type of the WCF service from binding="wsHttpBinding" to binding="basicHttpBinding".

This insures that your .NET web service would support clients and other services that conform to the WS-I standards.

You can see an example of such configuration in my blog posts named:

PHP calling .NET - PHP to WCF communication

and

PHP calling .NET - PHP to WCF calls with parameters