If you try to use ias-console to restart report server in 9.0.4 Oracle application server, you will get the following error :
An error occurred while restarting "Reports Server: rep_name??".
An error occurred while talking to OPMN. Could not find entity for "rep_name???".
name ?? is name of report server.
Do not be worry. There is nothing wrong with report server.As Oracle confirmed in metalink note 299508.1, ias-console can not be used in 9.0.4 to bounce report server. (However start/stop button for report server in iasconsole is active !!!)Starting report server has to happen through opmn only.