Hi All,
I have the same problem as Praspai.
I have done all the pre-requistis for the IS clustering 7.1.2 in UAT and pre-prod. The UAT worked but, in preprod all the clustered servers are not listed 
- They are pointing to same broker server with same client prefix (the broker server is one different host machine).
- Both pointing to same JDBC conn.
- Changed the broker URL in WmOptimize folder and reloaded it.
- The multicasting is enabled in both the environment.
The difference btw UAT and preprod envi:
1a) I installed all the components (IS, MWS, Broker, Optimize,etc) in both the UAT servers, and ran the ‘DB component configuration’ tool choosing ‘ALL’ products.
1b) BUT in pre-prod, I installed only each components in its dedicated host machines and ran the ‘DB configurator’ choosing only ‘PRODUCT - Integration Server’ for the IS box.
Is this difference a problem…Do I have to choose ‘ALL’ or something more than this??
I am stuck up with this for hours, which actually I thought is only 5 mins job 
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