Error when trying to GET data from HTTPClient in a native application

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Able to get Bearer token etc.

Now when I try to call the CRM Web service using HTTPClient Get Async, I get this error:

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Michel van den Brink 4,697 on at

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Hello Jeetus,

This is an issue you will get when not performing the request on TLS 1.2

Microsoft announced last year it would start making it manditory to use TLS 1.2 when consuming the Dynamics 365 API and resources on version 9 organizations (Article in question: https://blogs.msdn.microsoft.com/crm/2017/09/28/updates-coming-to-dynamics-365-customer-engagement-connection-security/ ) Messages about this have also been appearing over the last few weeks in the Office 365 message center.

On to solutions:

If you're building an application using .NET Framework 4.5.2 or below, then your app is NOT YET configured to use TLS 1.2, which you will need to do.

The most future proof solution is to change the target framework of your application to a minimum of .NET Framework 4.6.2 - that way it will default to using TLS 1.2

This is the recommended solution

Alternative: If you do not have the ability to change the target framework version of your application, you can add this line of code to your application, before you make any HTTP calls to Dynamics 365. This will force your application to use TLS 1.2 under all circumstances.

This is a work-around and not a great future proof solution but, good enough if you're in a pinch.

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;

Hope my answer helps you out, if you have any other questions, let me know.

If you found my answer useful, please mark it as such/verified :-)

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