In order to be able to access external data, Excel Services requires either Kerberos, or SSO to be enabled on the farm. First, ...

In order to be able to access external data, Excel Services requires either Kerberos, or SSO to be enabled on the farm. First, you must turn on the Microsoft® Single Sign-on Service on your machine, and then you can select the Action link above to be taken to a page where you can enable SSO in the farm.
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