We ran into the same issue (10.2.0.1) and support referred us to this
note (284602.1).  The note documents two solutions.  We implemented
solution one (rename ons.config), but the problem re-occurred 2 months
later.  Then we were told to implement both solutions.  This was about
3 weeks ago, so we will wait and see if it occurs again.

Rob Pegram
Duke University

--- Paula Stankus <paulastankus@yahoo.com> wrote:

> Help,
>    
>   Our apps servers suddenly were not able to connect to our
> databases.  Looking at the services it appeared that there were
> multiple listener processes running on port 1521.  We are using
> Oracle listener 10g.  It looked as if the parent process was in fact
> the other listener process (original listener process) listening on
> port 1521.
>    
>   Is Oracle somehow spawning additional listener processes?
>    
>   Thanks,
>   Paula
>
>              
> ---------------------------------
> Sneak preview the  all-new Yahoo.com. It's not radically different.
> Just radically better.


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