Question : Oracle "timeout" problem

I am supporting an n-tiered application. The front end is an Eclipse plug in. The eclipse plug in sends XML messages to a middleware layer that connects to an Oracle database and returns an XML message.  At one site, a "timeout" has been set for security reasons. As a result, the middleware is losing connectivity to the database after 30 minutes and subsequent queries fail.

I have been told that the timeout has been set at  the database level, but cannot figure out what may have been done exactly.

My goal:  to reproduce this timeout error on my own system (I do not have an error message handy, but it was a standard "not connected to oracle" message - will post it if I can get it).  

Thanks

Answer : Oracle "timeout" problem

It could be a sqlnet.ora option on the middle tier

It could also be a profile set in the database

select * from dba_profiles where resource_name in ('IDLE_TIME','CONNECT_TIME')    --  use this to find what the parameters are set to

select username, profile from dba_users   -- use this to see what profile is assigned to the middle tier's account.