How to Enable TLS 1.2 for .NET Web Services: A Web.config Solution?

Enabling TLS 1.2 for .NET Web Services: A Web.config Approach

Troubleshooting TLS 1.2 Implementation:

Upgrading to .NET 4.6 didn't automatically enable TLS 1.2, as evidenced by persistent 4.0.30319 error messages.

Resolving the Issue: Web.config Configuration

To force the application pool to utilize .NET 4.6 and enable TLS 1.2 support, modify your Web.config file as follows:

<code class="language-xml"><system.web>
  <compilation targetFramework="4.6" />
  <httpRuntime targetFramework="4.6" />
  <authentication mode="Windows" />
  <pages controlRenderingCompatibilityVersion="4.0" />
</system.web></code>

Configuration Details:

• compilation: Sets the compilation target framework to .NET 4.6, instructing IIS to use this version.
• httpRuntime: Explicitly specifies .NET 4.6 for runtime execution, overriding default settings.
• authentication mode: Defines the authentication method.
• pages controlRenderingCompatibilityVersion: Sets the page rendering compatibility version.

Important Considerations:

• For optimal performance, recompiling your web service for .NET 4.6 is strongly recommended.
• Registry key modifications to enable TLS 1.2 are unreliable and may not provide consistent results.
• Avoid disabling SSL 3.0, TLS 1.0, or TLS 1.1 system-wide, as this could disrupt other web services.

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