Calc Manager 11.1.2.4.003 cannot connect to OLAP service - Issue when Essbase is in clustered enviro

Gurus,

I have 2 set of environments

TEST:

Server 1: Foundation, EPMA, Calc Manager, FDMEE

Server 2: Planning, EAS, APS

Server 3: Reporting and Framework, FR

Server 4: Essbase

and

PROD:

Server 1&2: Foundation, EPMA, Calc Manager, FDMEE

Server 3&4: Planning, EAS, APS

Server 5&6: Reporting and Framework, FR

Server 7&8: Essbase - Clustered (Active Passive Clustering using MSCS)

Both the environment are on the same patch levels for all the products.

ISSUE:

When I try to expand Essbase applications in PROD environment, I get the following error

Note: Calculation manager in the above screenshot is using the server name and not the cluster name while trying to expand the application.