Default webpage difference between RHServer versions 9 and 11

Hi team, 

I need your help please, it's about the default webapage that is loaded when i contact my robohelp server. 

I mean on our RH9 version when i browse that URL, it's loading the default projet published on the General area on robohelp server. 

Url : OLD-SERVER-NAME/robohelp/server

But when i do the same thing on the RH11 it's not displaying anything, apart a blank webpage like bellow : 

My question is , is there any way to configure RH11 server to automatically display a default webpage when the user browse or mention the url like that :

http://server_hostname/robohelp/server

or eventually through an alias : 

http://rxhelp.mydomain.com/robohelp/server

Thank you.