While working with a client yesterday we noticed users could not view Excel files in browser. A quick analysis of ULS logs revealed the following issue:

There was an error in communicating with Excel Calculation Services http://server_name:port/2a7905259ea644f3a2d8ebd2bcf1ee9f/ExcelService*.asmx exception: An error has occurred. ServerSession.GetNextServerHealthBased: There are no healthy servers although the number of available server in the farm is {1}; updated with no candidates available for the health based load balancing. The update duration was {0} millisecs.

Here is what you can do to fix this issue:

Hope this help!

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