Authentication realm, you will need to add the Nexus LDAP Authentication Realm to the Selected Realms in the Security section of the Server configuration panel. To load the Server configuration panel, click on the Server link under Administration in the Nexus menu. Once you have the Server configuration panel loaded, select OSS LDAP Authentication Realm in the Available Realms list under the Security section and click the Add button (or Left Arrow) as shown in Figure 8.1, “Adding the LDAP Authentication Realm to Available Realms”.
Next, click on the Save button in the Server configuration panel. To make sure that your Nexus instance attempts to authenticate against LDAP first, click on the OSS LDAP Authentication Realm in the Selected Realms list and drag it to the top of the list as shown in Figure 8.2, “Move the LDAP Authentication Realm to the Top of Selected”. This will ensure that Nexus will consult the LDAP Server before it consults the other Authentication Realms.
Note
Nexus will continue to fall-back to the Xml Authenticating Realm if it cannot authenticate a user against the LDAP server. If your LDAP server is unavailable, and you need to reconfigure the LDAP connection, you can always login as the default admin
