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Tableau Server 2018.2 comes with a new web-based server configuration utility called Tableau Services Manager (TSM). Upgrading to this version requires special steps. Please see this article for instructions on what has changed to ensure your upgrade goes smoothly.
This release contains a critical security fix to Tableau Desktop, Tableau Server, and Tableau Reader that reduces exposure to man-in-the-middle and denial of service vulnerabilities. To address these vulnerabilities, the OpenSSL library used by the affected Tableau products has been upgraded.