See the following docs bug: https://bugzilla.redhat.com/show_bug.cgi?id=1366001 The help text for the /host parameter is misleading. The current help text for the /host parameter is: /host [^<domainhost^>] : Indicates that domain mode is to be used with an optional domain controller name. A better description would be: Indicates that domain mode is to be used, with an optional domain/host controller name.