Sorry..hadn't finished my question. Sqlnet expire time is set to default (10 mins). I don't see anything in the alert logs. I suspect the layer between the dbs is causing this timeout but not due to resource limits on dbs. Is there a way to figure out firewall issues ? On Apr 6, 2011 11:59 AM, "Gokul Kumar Gopal" <gokulkumar.gopal@xxxxxxxxx> wrote: