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ECDSA cipher suite & RSA certificate support in Mendix Cloud TLS config #12055

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ECDSA cipher suite & RSA certificate support in Mendix Cloud TLS config #12055

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ECDSA cipher suite & RSA certificate support in Mendix Cloud TLS config
OlufunkeMoronfolu Oct 9, 2026
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Update TLS cipher suite and certificate support info
OlufunkeMoronfolu Oct 9, 2026
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6 changes: 6 additions & 0 deletions content/en/docs/deployment/mendix-cloud-deploy/custom-domains.md
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Expand Up @@ -100,6 +100,12 @@ For application-level certificates, you need to [upload](/developerportal/deploy

For central certificates, a single certificate managed by the Mendix Admin can be reused across multiple custom domains and applications, if applicable.

### Which Certificates and TLS Cipher Suites Does Mendix Cloud Support? {#supported-certificates}

Mendix Cloud currently supports only RSA certificates. The default `*.mendixcloud.com` domains use an RSA certificate, and you can only upload RSA certificates for custom domains. The `TLS_ECDHE_ECDSA_*` cipher suites are enabled in the Mendix Cloud Transport Layer Security (TLS) configuration. However, a server can only negotiate them when it presents an Elliptic Curve Digital Signature Algorithm (ECDSA) certificate. As a result, these cipher suites cannot be used yet.

With an RSA certificate, the TLS 1.2 cipher suites that work are the `TLS_ECDHE_RSA_*` suites, such as `TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256` and `TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384`.

## Read More

* [Certificate Management](/control-center/certificate-management/)
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2 changes: 2 additions & 0 deletions content/en/docs/releasenotes/deployment/mendix-cloud/2025.md
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Expand Up @@ -117,6 +117,8 @@ We will also introduce new, recommended SSL/TLS ciphers. These additions will fi
* `TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256`
* `TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256`

The `TLS_ECDHE_ECDSA_*` cipher suites require an ECDSA certificate, which Mendix Cloud doesn't currently support. For details, refer to the [Which Certificates and TLS Cipher Suites Does Mendix Cloud Support?](/developerportal/deploy/custom-domains/#supported-certificates) section in *Custom Domains*.

## September 2025

### September 21, 2025
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