title: The request was aborted could not create SSL/TLS secure channel - HttpWebRequest
body: <p>I am making a webrequest to an 3rd party api and it was working fine. In between the certificate was changed for the API and now when i make the request from our dev environment, I am getting response as The request was aborted could not create SSL/TLS secure channel.
  I tried setting different protocol in code and there is no change in the response. I was getting a different error in explorer also. But that was fixed after enabling SSL 3.
  I am using httpwebrequest in the code. The initial dll was in .net 3.5 and it has been updated to .net 4.6 now.
  When checking the certificate details in firefox, i can see the certificate is TLS 1.3. As far as i understand it is not supported in .net 4.6.1 as i get protocol not supported error when i set it TLS   value.
  The dev environment is a Windows server 2016. The same API is working in production in Microsoft cloud. Not sure about the exact server version.</p>
  <p>Is there any way i can fix this issue.</p>
  <p><strong>Update</strong>
  The certificate algorithm was not there in the cipher suites. Followed the below document to add the cipher suite and the issue is now resolved.</p>
  <p><a href="https://docs.microsoft.com/en-us/windows-server/security/tls/manage-tls" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/windows-server/security/tls/manage-tls</a></p>