# CA certificate management

A CA certificate is a digital certificate issued by a certificate authority (CA). The system uses well-known CA certificates to establish trust with external services. For example, when using a KMS. If a different CA certificate is required for Weka servers to establish trust, set this custom CA certificate on the Weka servers.

**Related topics**

[manage-the-ca-certificate-using-the-gui](https://docs.weka.io/4.2/usage/security/ca-certificate-management/manage-the-ca-certificate-using-the-gui "mention")

[manage-the-ca-certificate-using-the-cli](https://docs.weka.io/4.2/usage/security/ca-certificate-management/manage-the-ca-certificate-using-the-cli "mention")