Want to set up an URL redirection when service Cognos 11 is stopped

[pdeneche]

Hi,

Every night, we shut down the Cognos Service during ETL jobs.
At the end of loading jobs, we start the Cognos Windows Service.
In Cognos C10, we have found a solution, consisting in modifying the errorpage.html of the webcontent folder, by testing the error code. Cognos was installed in cgi-bin mode.
=> During ETL jobs, the user is redirected on a custom page "loading... please wait".

Now, we have installed the 11.0.4 version, with ISAPI mode.
I don't find how to setup the same system beacause each time, when the service is off,
the url is :
http://myserveur/decisionnel
and after a fiew seconds, it is redirected to http://myserveur/decisionnel/bi with a BLANK page and unfortunately, I don't know where to find this page or how to modify this.
Where can I test if service Cognos 11 is running and to redirect on a custom page if it's off?

thank you for your help.

Pierre