Communication failure between crm 2015 on premise and external TLS 1.2 server

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Posted on by Closing The gap

Hi,

I am working on a application which is crm 2015 on premise. recently an external server got updated to TLS 1.2, and the custom workflows which were communicated to them previously were unable to communicate now.

Not sure, the reason .

I tried adding below code to my C# code still I am unable to establish a communication between the CRM and External server.

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12

I found below blog post still unable to resolve the issue.

blogs.perficient.com/.../

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Pedro Cadavez de Fr... on at

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Hello "Closing the Gap",

Hope you are well.

Do you have any further details on the actual exception?

I would start by evaluating the enabled protocols and cyphers on both ends using iiscrypto: www.nartac.com/.../

Then understand:

- Is the target only offering tls 1.2?

- Is the source tls 1.2 enabled?

- Evaluate enforcing tls 1.2 on the source as per:

docs.microsoft.com/.../unified-service-desk-and-tls-1-2-mandate-for-dynamics-365-online

Let us know how it goes

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