Rockwell Automation FactoryTalk Historian SE DataLink 4.2 User Guide - Manual (Page 117)

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Trust for the user, domain, application or machine (per Trust
configurations).
2. If all attempts to login to the FactoryTalk Historian server using
FactoryTalk Security/Windows credentials or other machine-related
information fail, then you must have a FactoryTalk Historian ME
native security user account (not FactoryTalk Security/Windows
security-based). In this case, the PI SDK attempts to use the native
FactoryTalk Historian ME user account configured for the server.
3. If the default native FactoryTalk Historian ME user account does not
require a password, then you are automatically logged in. If the default
account does require a password, a login dialog box appears, which
expects the native FactoryTalk Historian ME user account and
password.
For more detailed information on FactoryTalk Historian server security, see
the FactoryTalk Historian SE Installation and Configuration Guide , shipped with the
FactoryTalk Historian server.