Host IP: 10.204.1.3
Port: 1521
DB Name: PROD

string connString = "DATA SOURCE=10.204.1.3:1521/PROD;PERSIST SECURITY" +
"INFO=True;USER ID=username; PASSWORD=userpass";
OracleConnection conn = new OracleConnection(connString);
conn.Open();

An unhandled exception of type 'System.NullReferenceException' occurred in
Oracle.DataAccess.dll