Exchange 2010 CAS Mailbox Re-direction / Proxying Not Working Properly

Hello Team
In my Exchange 2010  Lab Setup, CAS proxy is not working properly
In Site A :  One DC , One HUb Server , 2 CAS Server (CAS ARRAY WIndows NLB), Mailbox Server 2 (DAG)
In Site B : One ADC one hub and CAS( Both are in same box) One Mailbox
Internal and External for SITE A  on Server CASARRAY1.labbites.co.in  is https://casarray1.labbites.co.in/owa  and https://casarray1.labbites.co.in/owa
Internal and External for SITE A  on Server CASARRAY2.labbites.co.in  is https://casarray2.labbites.co.in/owa  and https://casarray2.labbites.co.in/owa
DNS recory casarray.labbites.co.in is present 
Internal and External for SITE B on Server INDLBGUEX01.labbites.co.in is https://indlbguex01.labbites.co.in/owa  and https://indlbguex01.labbites.co.in/owa 
The problem is occurs , whenever the second CAS server casarray2.labbites.co.in is down (Shutdown)
Now , when the user ifrom site A s trying to log in to the OWA with SITE B OWA LINK https://indlbguex01.labbites.co.in/owa  it redirects to always https://casarray2.labbites.co.in/owa , since casarray2 server is down the OWA  page
is not opening
My Question is Why the proxy re-direction is always going to second casarray2 server instead of  casarray.labbites.co.in
how to correct it . please help me to over come the issue 

Hi Albert
Thanks for you update 
Get-mailboxdatabase | FT name, RPC*
Name                             RpcClientAccessServer 
DB1                                casarray.labbites.co.in
DB2                                casarray.labbites.co.in
DB3                                casarray.labbites.co.in
Site B Mbx -DB1              INDLBGUEX01.labbites.co.in
The user is administartor who beloings to DB1 and accesing the OWA from the SITE B  CAS server link https://indlbguex01.labbites.co.in/owa
and it is redirecting to https://casarray2.labbites.co.in/owa 
so as per the above
output , should i make RPCclientaccess server for Site B Mbx -DB1   as casarray.labbites.co.in

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