The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

I got below error while calling web api on https and found the solution.

Error

System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

  

Solution

I solved this error by adding this line before calling the web method:

System.Net.ServicePointManager.ServerCertificateValidationCallback = (senderX, certificate, chain, sslPolicyErrors) => { return true; };

Hope this will help you and save your time.

Enjoy !!!

:)