exchange 2010 CAS Array and WNLB

Dear All ,

I have an issue in Exchange 2010 Cas Array configuration with WNLB

I have two physical Hyper-v server's and each one hosts virtual  HUP CAS and one MB DAG as follow :

SRV1: physical server and host virtual HUPCAS1



SRV2: physical server and host virtual HUPCAS2



the NLB NIC's in both hupcas1 and hupcas2 are virtual and on the virtual switch in hyper-v and also on the separate adapter .

I have CAS array record in  DNS named casarray.domain.local IP :

A record in DNS :

my WNLB cluster name also casarray.domain.local IP :

my problem , I'm not able to reach the cluster from clients side even I have assigned default gateway in the private NLB NIC for both hosts hubcas1 and hubcas2

but I can reach the private NLB NIC from client
clients are on the same subnet and we have no issue in Vlans

note : a while ago a cluster  IP was reachable from all clients and the CAS Array was working fine but suddenly the request time out shows up and now I can't reach it anymore ,have u face same issue before ? we are also checking in the switching side , we have HP core switch

the cluster configuration is multicast and also I tried IGMP multicast but still not reachable ,?
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Nathan PSystems ArchitectCommented:
If your IP addresses are correct in this post, you have a clash. appears twice.

Is this supposed to happen?

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csh2010Author Commented:
Hi LecrtricX  , thank you for the post the IP is not

it was my mistake IP ==> NIC of NLB  for HUPCAS2

any suggestion ?
csh2010Author Commented:
I've requested that this question be deleted for the following reason:

no answer
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