Getting error while using GetUserContextEx via Web Application

Hi,

We have a web application developed in .NET Framework 2.0 which fetches details of AD objects from the DC using the secure32.dll. However, when the web application is deployed on a member server, the below error is thrown while fetching the details of the administrator:

Inner Exception: GetUserNameEx 1317
System.Exception: GetUserNameEx 1317

When the web application is installed on the DC, the fetching operation is successful. Please suggest, as this is blocking us. Let me know if further information is required.

Please note that we have two DCs with 2008R2 and 2012R2 OS and a member server with 2012R2 OS.