.NET Core API not accessible using secured link (i.e. https://......). Same API is accessible when accessing it with unsecured link (i.e. http://....)

Question

I've a .NET Core Controller API.

When accessing the Web Method(s) through secured link, i.e. https:///api/values, it's not working
If I'm accessing it with unsecured link, i.e. http:///api/values, it's working fine.

Please let me know if I need to do something into my Startup.cs or appsettings.json

Sample Code to access the API:

try { string serviceUrl= "https://domainname/api/values"; HttpClient client = new HttpClient(); HttpResponseMessage response = client.GetAsync(serviceUrl).Result; string stringData = response.Content.ReadAsStringAsync().Result; } catch (Exception ex) { throw ex; }

Hello Chetan, Thanks for your reply. It's throwing exception when trying to access it. Message: The underlying connection was closed: An unexpected error occurred on a send. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. Regards, Ashish — Ashish Tripathi
– Ashish Tripathi, Commented Oct 15, 2019 at 10:07
Are you using IIS to browse your code locally? because if that is the case then http makes sense. — shuberman
– shuberman, Commented Oct 15, 2019 at 10:16
Write System.Net.ServicePointManager.SecurityProtocol as first line in try block — Chetan
– Chetan, Commented Oct 15, 2019 at 10:17
I'm publishing my code on Azure. After publish, if I'm making my application secured i.e. https - When I'm trying to access it (through a client app. in my case it's VSTO Add-In), throws exception. - If I'm not securing the application/ site and accessing it, it's working. — Ashish Tripathi
– Ashish Tripathi, Commented Oct 15, 2019 at 10:27

Ashish Tripathi · Accepted Answer · 2019-10-15 12:32:19Z

Adding ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

solves the issue and I get the data back from my .NET Core API.

Note: I was facing issue in accessing .NET Core Controller API through Miscrosoft Word VSTO-AddIn

try { /*This is the Line I added and it makes my .NET Core API Accessible in my VSTO-AddIn */ ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; string serviceUrl= "https://domainname/api/values"; HttpClient client = new HttpClient(); HttpResponseMessage response = client.GetAsync(serviceUrl).Result; string stringData = response.Content.ReadAsStringAsync().Result; } catch (Exception ex) { throw ex; }

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