I have a .NET application that connects to an Oracle database to submit requests using the oracle client utilities on the server (Named instance via the oracle client). When the app is started, everything works fine but after a while I start getting ORA-03113 errors. I know this is the firewall between the app and database dropping the connections, but as soon as a new session comes up everything is fine. I was wondering if there is a way in the sqlnet.ora or tnsnames.ora files of the application server to set an idle connection timeout so it drops the connect before the firewall session timeout. If you can let me know this I would appreciate it.