How Can I Ensure My .NET Web Service Uses TLS 1.2?

Securing Your .NET Web Service with TLS 1.2

For optimal security, your .NET web service should utilize TLS 1.2. While upgrading to .NET Framework 4.6 or later is the recommended approach, verifying the application pool's actual .NET version is crucial.

Verifying Your .NET Framework Version

To confirm your application pool uses .NET 4.6 or a later version, follow these steps: In IIS Manager, navigate to Application Pools, select your application pool, and open Advanced Settings. Check the .NET CLR Version; it should be v4.0.30319 or higher. If not, proceed with the following configuration changes.

Configuring TLS 1.2 Support

1. Update Web.config: Within your web service's Web.config file, locate the <system.web> section and add these lines:

<code class="language-xml"><compilation targetFramework="4.6" />
<httpRuntime targetFramework="4.6" /></code>

2. Rebuild Your Project: Rebuild your web service project in Visual Studio, ensuring it targets .NET Framework 4.6 or later.

3. Restart the Application Pool: Restart the application pool associated with your web service to implement the changes.

By completing these steps, IIS will explicitly run your web service using .NET Framework 4.6 (or higher), which inherently supports TLS 1.2. Consequently, connections to external servers requiring TLS 1.2 should function correctly.

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