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https://askubuntu.com/questions/574551/cannot-login-into-new-install-of-openldap
https://github.com/nextcloud/server/issues/4177
https://www.linode.com/community/questions/76/why-am-i-getting-an-invalid-login-credentials-error-on-my-ldap-server
https://www2.microstrategy.com/producthelp/10.8/SystemAdmin/WebHelp/Lang_1033/Content/Admin/Troubleshooting_LDAP_authentication.htm
https://docs.pexip.com/admin/ldap_troubleshooting.htm
https://moodle.org/mod/forum/discuss.php?d=376424
https://moodle.org/mod/forum/discuss.php?d=176739
https://archive.sap.com/discussions/thread/3686264
https://www.ibm.com/support/knowledgecenter/de/SSSHTQ_8.1.0/com.ibm.netcool_OMNIbus.doc_8.1.0/omnibus/wip/common/reference/omn_trb_ldap_commonerrors.html
https://www.digitalocean.com/community/questions/unable-to-access-phpldapadmin-with-admin-account
https://www.drupal.org/project/ldap/issues/1607810
https://community.pivotal.io/s/article/LDAP-User-Login-Error-LDAP-Error-Code-49---Invalid-Credentials
https://forums.novell.com/showthread.php/415269-Error-starting-DHCP-on-oes