TLS cipher suite deprecation

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Overview

TLS is a security protocol that protects web traffic by providing confidentiality and integrity of data in transit between clients and servers. During a TLS session, both parties agree on a cipher suite that dictates which cryptographic algorithms to use.

Datadog uses a modern cryptographic engine that requires specific cipher suite configurations.

Client compatibility

Datadog’s systems require TLS 1.2 or higher. Compatible clients can negotiate cipher suites, but specific client-side configurations may alter this behavior.

The Datadog Agent is configured to use modern cipher suites and is compatible with Datadog’s requirements. If you experience connection issues, they typically originate from custom integrations, scripts, or older HTTP clients such as certain versions of Windows PowerShell or Ruby.

To test your client’s cipher suite compatibility, connect to tls-config-test.datadoghq.com, which is configured with Datadog’s accepted cipher suites. Alternatively, use the How’s My SSL? API to check the cipher suites your client supports. For assistance troubleshooting connection issues, contact Datadog support.

Accepted cipher suites

Effective September 1, 2026, Datadog will accept only the following cipher suites:

Code	IANA Name
`0xC0,0x2B`	`TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256`
`0xC0,0x2F`	`TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256`
`0xC0,0x2C`	`TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384`
`0xC0,0x30`	`TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384`
`0xCC,0xA9`	`TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256`
`0xCC,0xA8`	`TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256`
`0xC0,0x09`	`TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA`
`0xC0,0x0A`	`TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA`
`0x13,0x01`	`TLS_AES_128_GCM_SHA256`
`0x13,0x02`	`TLS_AES_256_GCM_SHA384`
`0x13,0x03`	`TLS_CHACHA20_POLY1305_SHA256`

Datadog accepts the following cipher suites for :

Code	IANA Name
`0xC0,0x2F`	`TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256`
`0xC0,0x30`	`TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384`
`0xC0,0x2B`	`TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256`
`0xC0,0x2C`	`TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384`

Disabled cipher suites

Datadog has disabled support for the following cipher suites, which are considered weak under modern security standards.

Effective September 1, 2026

Beginning September 1, 2026, Datadog will disable support for the following cipher suites:

Code	IANA Name	OpenSSL Name
`0xC0,0x14`	`TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA`	`ECDHE-RSA-AES256-SHA`
`0xC0,0x13`	`TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA`	`ECDHE-RSA-AES128-SHA`
`0x00,0x9D`	`TLS_RSA_WITH_AES_256_GCM_SHA384`	`AES256-GCM-SHA384`
`0x00,0x9C`	`TLS_RSA_WITH_AES_128_GCM_SHA256`	`AES128-GCM-SHA256`
`0x00,0x35`	`TLS_RSA_WITH_AES_256_CBC_SHA`	`AES256-SHA`
`0x00,0x2F`	`TLS_RSA_WITH_AES_128_CBC_SHA`	`AES128-SHA`

Effective April 1, 2024

As of April 1, 2024, Datadog does not support the following cipher suites across its public-facing applications. Clients using these cipher suites receive connection error messages.

Code	IANA Name
`0xC0,0x27`	`TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256`
`0xC0,0x23`	`TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256`
`0xC0,0x28`	`TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384`
`0xC0,0x24`	`TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384`
`0x00,0x3C`	`TLS_RSA_WITH_AES_128_CBC_SHA256`
`0x00,0x3D`	`TLS_RSA_WITH_AES_256_CBC_SHA256`