Hi! Well, when talking about Active Directory, even if it is a Linux server what we talk about, I can only see advantages on joining the machine to the domain. However, not a requirement indeed, just my advice. Besides: with SAS Studio you do not want, only, to authenticate, the underneath SAS foundation system process will need to run on the name of the user. Lets put it this way: it is a requirement that the local sas process will run on the name of the user. Meaning, the user has to be able to authenticate at the host level and to create processes. As long as you create this pre-requisite, you will be OK. An my recomendation is, to use one of the methods that will create a PAM registry, because it is easy to bring to SAS. The choice of the particular method, is yours. The aim, still the same: the user should be able to authenticate to the linux machine as he will authenticate to SAS. Does it help?
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