I have noticed that unix tools like 'powerbroker' aka sudo type tools, can force a disconnect. But those are respectful of nohup sessions and don't disconnect them when configured properly. Try with unix and network. Do you see waht kind of disconnect you see? server process goes away? any trace files? raj On Wed, Apr 30, 2008 at 11:12 AM, Kline.Michael <Michael.Kline@xxxxxxxxxxxx> wrote: > We have a large test running for a client. It appears ALL DB > connects time out in 12 hours and 20 minutes. There isn't any sqlnet.ora > file on the database server. >