How to Force My .NET Web Service to Use TLS 1.2?

Ensuring Your .NET Web Service Uses TLS 1.2

To connect your .NET web service to a service requiring TLS 1.2, you must use .NET Framework 4.6 or a later version. While .NET 4.6 generally defaults to TLS 1.2, some configurations may still use older protocols. This guide will show you how to guarantee TLS 1.2 is employed.

Verifying .NET Version and Enabling TLS 1.2 Support

First, check your web service's .NET Framework version in IIS (Internet Information Services) by examining the application pool settings. If it's not .NET 4.6 or higher, create a new application pool specifying .NET 4.6 or later. Note that because .NET 4.6 is an in-place update for .NET 4.0, IIS might still show .NET 4.0 even after the upgrade.

Modifying the Web.config File

To explicitly force the use of .NET 4.6, modify your Web.config file. This provides a more reliable method than relying solely on the application pool settings:

<system.web>
  <compilation targetFramework="4.6" />
  <httpRuntime targetFramework="4.6" />
  <authentication mode="Windows" />
  <pages controlRenderingCompatibilityVersion="4.0" />
</system.web>

Rebuilding the Web Service

After updating the Web.config file, rebuild your web service project. This ensures the changes take effect. Once rebuilt and deployed, your web service should utilize .NET 4.6 and, consequently, support TLS 1.2.

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