Documentation:LocalhostDevCert

Note: From 210405 Turnkey core and MDrivenServer core allow for http access by sending in parameter -nohttps as described here LocalServers

In order to let the server talk over SSL without security warnings there must exists ssl-certificates for localhost:PortNo.

This is what is typically called a Developer Certificate.

In order to register the developer-ssl cert you must have the .netCore SDK installed.

If you have it already jump to step 2.

1. Download the .netCore3.1 SDK https://dotnet.microsoft.com/download/dotnet-core/thank-you/sdk-3.1.404-windows-x64-installer and install it.
2. In a cmd window paste this and press enter:

dotnet dev-certs https --trust

If you suspect that there is something wrong try to clean it first:

dotnet dev-certs https --clean
dotnet dev-certs https --trust