Resolve Multiple HTTPS Port Bindings

Note: This was introduced in .NET 6, it should not affect older versions

Note: This only occurs when IIS Sites have multiple HTTPS port bindings

If Web Applications are down, and you see this message in the log file:

Cannot determine the https port from IServerAddressesFeature, multiple values were found. Set the desired port explicitly on HttpsRedirectionOptions.HttpsPort.

The Web Applications can brought back online with a minor modification to the appsettings.json file for the application.

In the root of the appsettings.json add a new entry and restart the IIS application

{
    ...

    "https_port": 443
}