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Note: This is an optional solution to configure ArcGIS Desktop to use TLS 1.2. For a description of the other options, including the recommended one, see: FAQ: How do I enable TLS 1.2 on ArcGIS Desktop?
As part of improving ArcGIS Online security, Esri requires TLS 1.2 connections for ArcGIS Online services. Action is necessary to ensure access to these services.
The methods below describe how to configure the Windows operating system to use TLS 1.2. This enables all applications on the system that depend on the Microsoft .NET Framework to use TLS 1.2.
Note: Esri has certified that setting the .NET environment to enable TLS 1.2 will not cause problems with ArcGIS; however, this may impact other .NET applications by changing their default TLS behavior. Consult a qualified computer systems professional, if necessary.
Note: After configuring and testing ArcGIS Desktop to use TLS 1.2, return to the Esri Support TLS Page for instructions on how to use TLS 1.2 with other Esri products.
The steps to enable Windows to use TLS 1.2 depend on the version of the .NET Framework installed on the system. Esri recommends using .NET4, if possible.
Note: See the Product Life Cycle pages on the Esri Support site for the support status of each released version of ArcGIS Desktop.