-*Breaking change in Redpanda 25.2:* Ephemeral credentials for HTTP Proxy are removed. If your HTTP Proxy API listeners use `authentication_method: none`, you must configure explicit SASL credentials (xref:reference:properties/broker-properties.adoc#scram_username[`scram_username`], xref:reference:properties/broker-properties.adoc#scram_password[`scram_password`], and xref:reference:properties/broker-properties.adoc#sasl_mechanism[`sasl_mechanism`]) for HTTP Proxy to authenticate with the Kafka API. Without these credentials, HTTP Proxy will attempt unauthenticated connections to the Kafka API. Redpanda Data recommends enabling authentication on both HTTP Proxy and the Kafka API. For configuration instructions, see xref:manage:security/authentication.adoc#schema-and-http-to-redpanda[Configure HTTP Proxy to connect to Redpanda with SASL].
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