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Mastering Zabbix - Second Edition by Andrea Dalle Vacche

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Security considerations

One of the few drawbacks of the whole Zabbix architecture is the lack of built-in security at the Zabbix protocol level. While it's possible to protect both the web frontend and the Zabbix API by means of a standard SSL layer to encrypt communications by relying on different authorities for identification, there's simply no standard way to protect communication between the agents and the server, between proxies and the server, or among nodes. There's no standard way even when it comes to message authentication (the other party is indeed who it says it is), when it comes to message integrity (the data has not been tampered with), or when it comes to message confidentiality (no one else can read or understand the data).

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