Create a Local Domain SMS Service Account in a Windows NT Domain
Caution Make sure that the SMS Service account password is different than the account name, because Windows NT and NetWare servers can be configured to prohibit accounts with passwords that are the same as the account name.
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For a greater level of security, add the SMS Service account to the local Administrators group on all SMS site systems. (In this case, you must also specify the SMS Client Remote Installation account.)
Specify a New SMS Service Account
About the SMS Service Account
SMS Accounts Configuration Overview