Unable to open Oracle database connection

Hi,

We have a classic ASP web application talking to Oracle database. Currently we are migrating this application to a new server whose OS is Windows Server 2012 R2. On the new server, we have installed & configured Oracle client successfully. TNSping, sqlplus, ODBC Data Source Administrator are all working properly. However, we are still facing a database connection issue of below.

Code:

<%
Response.Write "<script>alert('Hello1');</script>"
set MyCon = server.createobject("ADODB.connection")
Response.Write "<script>alert('Hello2');</script>"
MyCon.open "DRIVER={Microsoft ODBC for Oracle};ConnectionString=TNSName;UID=Username;PWD=Password;"
Response.Write"<script>alert('Hello3');</script>"
%>

Error message:

Microsoft OLE DB Provider for ODBC Drivers error '80004005'

[Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed

/MSDS/test.asp, line 21

Hello1 & Hello2 popped up. But Hello3 didn't pop up. Do you have any ideas?

Thanks,

高麻雀