I had to make several changes, including code changes to the ASP.NET WebAPI services and changes to our Azure hosting environments.Īs many current servers are moving towards TLS 1.2/1.3 and removing support for TLS 1.0 /1.1, connectivity issues between newer servers and older (legacy). I was able to run the third-party APIs from our local test environment, but not when I ran them from our staging / production environments which were hosted on Azure. Transport Layer Security (TLS) best practices with the. TLS 1.2 will eventually be replaced by the newest released standard TLS 1.3 which is faster and has improved security TLS 1.2 is a standard that provides security improvements over previous versions. The Transport Layer Security (TLS) protocol is an industry standard designed to help protect the privacy of information communicated over the Internet. After some discussion with one of the developers of the third-party APIs, he suggested the issue may be related to TLS 1.2 not being supported as he had seen the issue before.įirstly, what is TLS? Here’s a definition from a Microsoft article that describes TLS best practices with regards to the. All requests to the third-party API were returning empty responses. Unfortunately, this included our own APIs. These third-party APIs were configured to disable any requests from clients that were using TLS 1.0/1.1. I recently came across an issue with several of our ASP.NET WebAPI services which were consuming a third-party set of APIs. It would be greatly appreciated if someone could navigate for resolving above exception.Enabling TLS 1.2 on your. I tried using ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls For further questions, please contact your administrator. Please refer to and conduct needed actions to remediate the issue. Message=AADSTS1002016: You are using TLS version 1.0, 1.1 and/or 3DES cipher which are deprecated to improve the security posture of Azure AD. Var authResult = await cca.AcquireTokenForClient(ewsScopes)Ĭonsole.WriteLine($'Error acquiring access token: ') Var cca = ConfidentialClientApplicationBuilder However while testing below code I got depreciated exception.

First of am very newbie to C# development and trying to switch the authentication from basic to oauth based one.

How to test tls 1.2 .net