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Problem with WNLB with virtualised CAS Servers

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Last Modified: 2016-10-03
Dear Experts,

I have following environment:

2 x CAS EXchange 2010 Servers
2 x MB Exchange 2010 Servers

MB Servers are configured with DAG and working fine, now i am trying to configure  WNLB on CAS Servers, The operating System i have is Windows Server 2008 R2 SP1, All Servers are in same VLAN.

Issue:
I created NLB Cluster on CAS01 and all went ok, as soon as i added CAS02 in that cluster. CAS01 cannot ping to MB 02 and CAS02 cannot ping to MB 01 and vice versa.

whereas cas 01 can communicate with MB01 and CAS 02 can communicate with MB02.

Please advise asap. i am stuck with this strange issue.
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