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-With the [OpenProject Enterprise Edition](https://www.openproject.org/enterprise-edition/) it is possible to [synchronize LDAP and OpenProject groups](./ldap-group-synchronization).
+With the [OpenProject Enterprise Edition](https://www.openproject.org/enterprise-edition/) it is possible to [synchronize LDAP and OpenProject groups](./ldap-group-synchronization).
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+## Multiple LDAP connections
+
+OpenProject supports multiple LDAP connections to source users from. The user's authentication source is remembered the first time it is created (but can be switched in the administration backend). This ensures that the correct connection / LDAP source will be used for the user.
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+Duplicates in the unique attributes (login, email) are not allowed and a second user with the same attributes will not be able to login. Please ensure that amongst all LDAP connections, a unique attribute is used that does not result in conflicting logins.