SSL connection could not be established with .Net HttpClient

Question

Hi,

Attempting to make api calls to Yelp Fusion via .Net 3.1 api but receiving the following error:

Error Message: The SSL connection could not be established, see inner exception. Source: System.Net.Http Trace: at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore

Of course, the api call to Fusion from localhost runs fine. This appears to be a cipher issue??

Also, attempted to bypass the certificate with the following code:

HttpClientHandler clientHandler = new HttpClientHandler();
clientHandler.ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => cert.Verify(); //{ return true; };
using (HttpClient httpClient = new HttpClient(clientHandler)) {....

Any insight on how to resolve would be greatly appreciated

Answer 1

if it runs from localhost, then most likely its a firewall issue on the deployed host.