# Testing for expiring TLS and SSL certificates using Gremlin

DevFeed: [Testing for expiring TLS and SSL certificates using Gremlin](<https://devfeed.tech/articles/testing-for-expiring-tls-and-ssl-certificates-using-gremlin-11717.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/testing-for-expiring-tls-and-ssl-certificates-using-gremlin>)

Author: Andre Newman

Published: 2024-07-16T00:00:00Z

Content type: tutorial

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [TLS (Transport Layer Security)](<https://devfeed.tech/topics/tls.md>), [SSL](<https://devfeed.tech/topics/ssl.md>), [Encryption](<https://devfeed.tech/topics/encryption.md>), [Cryptography](<https://devfeed.tech/topics/cryptography.md>), [Security](<https://devfeed.tech/topics/security.md>), [browser](<https://devfeed.tech/topics/browser.md>), [client](<https://devfeed.tech/topics/client.md>)

Tags: [backend](<https://devfeed.tech/tags/backend.md>), [browser](<https://devfeed.tech/tags/browser.md>), [cryptography](<https://devfeed.tech/tags/cryptography.md>), [encryption](<https://devfeed.tech/tags/encryption.md>), [security](<https://devfeed.tech/tags/security.md>), [ssl](<https://devfeed.tech/tags/ssl.md>), [testing](<https://devfeed.tech/tags/testing.md>), [tls](<https://devfeed.tech/tags/tls.md>), [web](<https://devfeed.tech/tags/web.md>)

## AI overview

This tutorial explains why TLS and SSL certificates expire and must be replaced, including when third-party services fail to rotate them reliably. It presents Gremlin as a way to test certificate chains for upcoming expirations and automate checks across services.

## Source excerpt

TLS certificates are a critical part of the modern web, but they require rotating. Learn why expiring certificates are such a big problem, and how Gremlin helps you stay ahead of them.