Need help with Sample SQL ODBC code - SQLDriverConnect() hangs for domain user.

Hi,

I am using sample code available at https://msdn.microsoft.com/en-us/library/ms715433(v=vs.85).aspx code to connect to SQL 2008 R2 instance on Windows 2008 R2 Standard. But the call SQLDriverConnect() hangs indefinitely for domain user "dev/test". I checked it has all the permissions set for this instance, and i am able to login to SQL Management studio using this user. The problem lies only with this host.

I also tried connecting to another instance on different host, and was able to connect to instance. I have tried searching for answers but could not find any?

Can someone please help me what could be the issue?

Thanks.