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What are the Azure Cache for Redis configuration settings for the TLS protocol?

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Transport Layer Security (TLS) is a cryptographic protocol that provides secure communication over a network. Azure Cache for Redis supports TLS on all tiers. When create a service that uses an Azure Cache for Redis instance, we strongly encourage you to connect using TLS.

Important

Starting November 01, 2024, TLS 1.0 and 1.1 will no longer be supported. You should use TLS 1.2 or 1.3 instead.

Scope of availability

This table contains the information for TLS availability in different tiers.

Tier Basic, Standard, Premium Enterprise, Enterprise Flash
Availability Yes (1.0(retired), 1.1(retired), 1.2, and 1.3) Yes (1.2 and 1.3)

TLS 1.3 support

TLS 1.3 is supported across all tiers of Azure Cache for Redis. Presently, there's no option to enforce that TLS 1.3 is used by clients. You're required to negotiate TLS 1.3 when connecting to the cache instance.

TLS cipher suites

TLS 1.2 cipher suites:

  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384
  • TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256

TLS 1.3 cipher suites:

  • TLS_AES_128_GCM_SHA256
  • TLS_AES_256_GCM_SHA384

Note

The TLS_CHACHA20_POLY1305_SHA256 cipher suite is no longer supported for TLS 1.3 connections. The TLS_AES_128_GCM_SHA256 or TLS_AES_256_GCM_SHA384 cipher suites can be used instead.

How to enable or disable TLS

Enabling and disabling TLS is different within different tiers. Here's the information for the two sets of Azure Cache for Redis tiers.

Basic, Standard, and Premium tiers

By default, TLS access is enabled in new caches, while non-TLS access is disabled. To enable the non-TLS port:

  1. Navigate to the Advanced settings on the Resource menu.
  2. Then, select No for Allow access only via SSL .
  3. select Save.

In nonclustered caches, port 6380 is used for TLS access, while port 6379 is used for non-TLS access.

In clustered caches, TLS-enabled caches use ports in the 150XX range, while non-TLS caches use ports in the 130XX range.

Enterprise and Enterprise Flash tiers

By default, only TLS access can be used. To disable TLS access:

  1. Navigate to the Advanced settings on the Resource menu.
  2. Select Enable for Non-TLS access only.
  3. Select Save.

Enterprise and Enterprise Flash tier caches use port 10000 for both TLS and non-TLS connections. If the OSS cluster policy is used, more connections are established using ports in the 85XX range, regardless of TLS status.

Remove TLS 1.0 and 1.1 from use with Azure Cache for Redis

For more information, see TLS 1.0/1.1 retirement.

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