Hi,
It seems like you have not got self-signed set up.
http://www.sharepointpals.com/post/How-to-Create-a-Self-Signed-Certificate-on-IIS-Server
This article may help.
Hi Viet,
For the initial phase of debugging, you can use a self-signed certificate for high trust app.
SharePoint 2013 does not normally accept self-signed certificates. So when you are using a self-signed certificate for debugging, add the following lines to turn off SharePoint's normal requirement that HTTPS be used when remote web applications call into SharePoint. If you don't, then youll get a 403 (forbidden) message when the remote web application calls SharePoint using a self-signed certificate.
$serviceConfig = Get-SPSecurityTokenServiceConfig $serviceConfig.AllowOAuthOverHttp = $true $serviceConfig.Update()
You can refer to the link below about more details of how to create a basic high-trust app for SharePoint with the Office Developer Tools for Visual Studio by using a self-signed certificate and an associated issuer ID:
https://msdn.microsoft.com/en-us/library/office/fp179901.aspx
Thanks,
Vi