Error page customization with WAS ND

[WASNDADMIN]

I'm trying to redirect users when the application is down.
The http server is on a distant machine (with a web-plugin.xml). And the users are accessing the application via a jsp.page which is on the WAS Server.
I tried many cases in my httpd.conf on the http server but none of them works:

End of my httpd.conf:

DocumentRoot "C:\Program Files\IBM HTTP Server/htdocs/en_US"
....
ErrorDocument 404 /servinterrupt.html
LoadModule ibm_app_server_http_module "C:\Program Files\WebSphere\AppServer/bin/mod_ibm_app_server_http.dll"
WebSpherePluginConfig "C:\Program Files\WebSphere\AppServer/config/cells/plugin-cfg.xml"

(Note: The servinterrupt.html page that I want the users to be redirected on is in the DocumentRoot directory).


I tried the same but with the and tags but none of them are working...

Any information about it ?

Thanks a lot for any help !