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AutoCAD Plant 3D and AutoCAD P&ID users please refer this article that contains information regarding Autodesk Identity Services moving to TLS 1.2 on August 3.
Transport Layer Security (TLS): Updates Required to Maintain Software Access
This applies to single-user subscribers using certain version of AutoCAD Plant 3D and AutoCAD P&ID listed below; customers using software or versions not listed and customers using perpetual or multi-user (network) licenses will not be affected.
AutoCAD P&ID 2014, 2015, 2016
AutoCAD Plant 3D 2014, 2015, 2016
