One ARR and 2 IIS

Hi guys,

 Now im going to explain my environment, all Windows 2008 R2 full patched.

Server 1:  ARR

With the IIS FARM pointed to ( Server 2 & Server 3)

Server 2: IIS

www.website1.com

Server 3: IIS

www.website2.com

 

Now when i go to IE and ask for www.website1.com the ARR route to the frist server without problem, but when i ask for www.website2.com ARR return me a 404 returned by Server1.  I checked via Health test the website www.website2.com and obiously the Server1 Fails ( Dont have that website) and the server 2 ( Pass ).

How can i do to ARR only return the PASS website not the first response? I dont know why ARR didnt discart the 404 if there one server in ISS FARM that return a PASS in Health Check.

This ARR is going to be implemented into a IIS FARM for over 10.000 Websites.