# \#active-directory

**URL:** https://community.icinga.com/tag/active-directory/405.md

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## [Icinga Web 2 LDAP authentication fails over LDAPS (636) – “Can’t contact LDAP server”](https://community.icinga.com/t/icinga-web-2-ldap-authentication-fails-over-ldaps-636-can-t-contact-ldap-server/15307)

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**Author:** [@samo.goljat](https://community.icinga.com/u/samo.goljat)\
**Replies:** 2\
**Last updated:** [December 23, 2025, 5:35am UTC](https://community.icinga.com/t/icinga-web-2-ldap-authentication-fails-over-ldaps-636-can-t-contact-ldap-server/15307 "2025-12-23T05:35:04Z")

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It’s production product, it stopped workiing over night from 17. 12. 2025 to 18. 12. 2025. It’s LDAP user: Admin user works tho: Any mistake in authentication.ini configuration: \[icingaweb2\] backend = “db” …