We had a similar problem with db links from sql2005 to ora10.2; I initially used msdaora.dll. It caused errors: WARNING: inbound connection timed out (ORA-3136) And eventually prevented new oracle logins; this is fixed in 10.2.0.4. Switching to the OraOledb.oracle provider fixed the problem until we can patch. From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Taylor, Chris David Sent: Wednesday, November 19, 2008 11:58 AM To: ORACLE-L Subject: MSDAORA.DLL (Microsoft OLE DB For Oracle) Connectivity Question We have a VB app using MSDAORA.DLL that doesn't seem to be disconnecting from the DB even though we have a connection close command in the VB program. Any of you seen something like this? We're eating up our "OPEN_CURSOR" count for this session as it process a lot of events and then finally errors out. I really think the problem is that the "OpenConnection" command from VB isn't getting sucessfully closed and reconnected. Thoughts? Chris Taylor Sr. Oracle DBA Ingram Barge Company Nashville, TN 37205 Office: 615-517-3355 Cell: 615-354-4799 Email: chris.taylor@xxxxxxxxxxxxxxx