Symptoms

Publishing SmartObjects as WCF services has been configured (see config.png).
When trying to execute any method of a SO via WCF getting 'Object reference not set to an instance of an object' error.
WSDL scheme downloads correctly. Visual Studio Wcf Test Client is used for testing (see wcftester.png).
 

Diagnoses

A miss configuration must have caused this issue.


 

Resolution

We found the solution. We changed bindingConfiguration to basicHttpBinding Basic in config file on K2Server and then successfully sended WCF request from BizTalk with basicHttpBinding Basic security option.