---
name: event-notifications-en-cipher
title: Understanding support for TLS versions and cipher suites
description: 'Event Notifications API end points allows only the following cipher suites:'
last-updated: 2026-09-02
---

> ## Documentation Index
> The table of contents for this documentation set is at https://cloud.ibm.com/docs/event-notifications?format=markdown
> The index for all IBM Cloud docs is at: https://cloud.ibm.com/docs/llms.txt
> Use these files to discover more information as needed.

# Understanding support for TLS versions and cipher suites
{: #en-cipher-support}

## Which versions of TLS are supported by Event Notifications?
{: #en-tls-versions}

Event Notifications API endpoints support the following TLS versions:
- `TLS 1.3`
- `TLS 1.2`

## Which cipher suites are allowed by Event Notifications?
{: #en-cipher-allowed}

Event Notifications API end points allows only the following cipher suites:
{: shortdesc}

- `ECDHE-ECDSA-AES256-GCM-SHA384`
- `ECDHE-RSA-AES256-GCM-SHA384`
- `ECDHE-ECDSA-AES128-GCM-SHA256`
- `ECDHE-RSA-AES128-GCM-SHA256`