Help Center> Cloud Search Service> FAQ> Clusters in Security Mode> Can I Enable Security Mode Later to Add Authentication and Use SSL Communication If I Did Not Enable It When I Purchase a CSS Cluster for the First Time?
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Can I Enable Security Mode Later to Add Authentication and Use SSL Communication If I Did Not Enable It When I Purchase a CSS Cluster for the First Time?

Security mode cannot be enabled after a cluster is created. To enable security mode, you need to create a cluster in security mode. For details, see Clusters in Security Mode.