Primary Active Directory is down and need to configure secondary AD

Document ID : KB000111305
Last Modified Date : 06/09/2018
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We're running Active Directory as Primary User Store Server. But thisone went down and we'd like to
configure a Second Active Directory. We'd like to know how can we build a second User Store on Active Directory ?
To configure the second Active Directory as backend LDAP Server, you
need to make the second as replication of the first. To do this,
please consult your Active Directory team or Microsoft. Then, if you
need to configure Active Directory as Policy or User Store, you need
to follow our documentation :

Configure an Active Directory User Store Connection