# Certificate\_unknown in opensearch 3.3

**URL:** https://forum.opensearch.org/t/certificate-unknown-in-opensearch-3-3/27308
**Category:** OpenSearch
**Tags:** troubleshoot
**Created:** [October 16, 2025, 5:18pm UTC](https://forum.opensearch.org/t/certificate-unknown-in-opensearch-3-3/27308 "2025-10-16T17:18:49Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![Anthony](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/anthony/32/9939_2.png) [@Anthony](https://forum.opensearch.org/u/Anthony)
#### Post date: [December 3, 2025, 9:51am UTC](https://forum.opensearch.org/t/certificate-unknown-in-opensearch-3-3/27308/4 "2025-12-03T09:51:50Z")

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@GuyS This is to do with the hostname verification that was fixed in OS3.3, [this](https://forum.opensearch.org/t/exception-during-establishing-a-ssl-connection-javax-net-ssl-sslhandshakeexception-after-upgrading-to-opensearch-3-3/27381) forum case has further details.

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