"Enable forms-based authentication" checkbox is grayed out on clusters

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I noticed a thread on one of the Exchange yahoogroups a few weeks ago about how the "Enable FBA" checkbox was grayed out on a certain server. It turns out that this is the expected behavior on clustered servers (and as a workaround, can use a front-end to connect to the BE cluster, and enable FBA on that front-end). Based on that conversation, I wrote a KB article about this, and it's now public:

https://support.microsoft.com/?id=834637

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