ODBC connection to HANA in .net app

I am trying to connect to HANA database from a .net windows app.  Here is my code:

Dim _strConn AsString = "Driver={HDBODBC32};Server=172.16.xx.xx:31015;Database=xxx;UID=xxxxxx;PWD=xxxxxxx;"

Dim _conn AsOdbcConnection = NewOdbcConnection(_strConn)

_conn.Open()

I got the following error: {"ERROR [08S01] [SAP AG][LIBODBCHDB32 DLL][HDBODBC32] Communication link failure;-10709 Connection failed (RTE:[89006] Syste"}

Please help!  Thanks!

Tim