RestSharp response with http on https port ist cancelled by user

Question

I am building an error handling for my rest application which uses RestSharp (Version 108.0.2) for the communication. Lets say the server accepts http-requests on port 6543 and https-requests on port 3456. When I now use http://myServer:3456 (which generates an error like expected) I get a TaskCanceledException and the CancellationToken.IsCancellationRequested is true, so it looks like the user set the CancellationToken to true, but he did not. So why is it this way and can I get a better error description which is more explaining for non-programmers or at least get a difference between manual cancellation and wrong protocol, so I can translate this to the user?

For clarification I initialize the Client this way:

RestClientOptions options = new RestClientOptions()
{
    BaseUrl = new Uri(serviceUrl),
    PreAuthenticate = false,
    Timeout = cTimeout,
    UseDefaultCredentials = globalSettings.AuthMechanism != AuthMechanism.Basic,
    UserAgent = $"{Assembly.GetExecutingAssembly().GetName().Name}/{Assembly.GetExecutingAssembly().GetName().Version}"
};
RestClient = new RestClient(options);

So there is no cancellation token set on my side explicitly. Not even in the requests:

RestRequest request = new RestRequest($"{GlobalSettings.ApiSystemUrl}/info", Method.Get);
RestResponse result = await mRestClient.ExecuteAsync(request);

This is the raw result (in JSON) I get:

{
    "Request":
    {
        "AlwaysMultipartFormData": false,
        "MultipartFormQuoteParameters": false,
        "FormBoundary": null,
        "Parameters": [],
        "Files": [],
        "Method": 0,
        "Timeout": 0,
        "Resource": "/api/v1/info",
        "RequestFormat": 0,
        "RootElement": null,
        "OnBeforeDeserialization": null,
        "OnBeforeRequest": null,
        "OnAfterRequest": null,
        "Attempts": 1,
        "CompletionOption": 0,
        "ResponseWriter": null,
        "AdvancedResponseWriter": null
    },
    "ContentType": null,
    "ContentLength": null,
    "ContentEncoding": [],
    "Content": null,
    "StatusCode": 0,
    "IsSuccessful": false,
    "StatusDescription": null,
    "RawBytes": null,
    "ResponseUri": null,
    "Server": null,
    "Cookies": null,
    "Headers": null,
    "ContentHeaders": null,
    "ResponseStatus": 4,
    "ErrorMessage": "Eine Aufgabe wurde abgebrochen.",
    "ErrorException":
    {
        "ClassName": "System.Threading.Tasks.TaskCanceledException",
        "Message": "Eine Aufgabe wurde abgebrochen.",
        "Data": null,
        "InnerException": null,
        "HelpURL": null,
        "StackTraceString": "   bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   bei RestSharp.RestClient.<ExecuteInternal>d__1.MoveNext()",
        "RemoteStackTraceString": null,
        "RemoteStackIndex": 0,
        "ExceptionMethod": "8\nThrowForNonSuccess\nmscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\nSystem.Runtime.CompilerServices.TaskAwaiter\nVoid ThrowForNonSuccess(System.Threading.Tasks.Task)",
        "HResult": -2146233029,
        "Source": "mscorlib",
        "WatsonBuckets": null
    },
    "Version": null,
    "RootElement": null
}

Exception messages are server side settings in German that I now didn't translate, but as you can see, there is no InnerException or the like on my side.

Oh and I get this information like this:

if (!result.IsSuccessful)
....

if (result.ErrorException != null)
{
    if (result.ErrorException is TaskCanceledException cancel)
    {
        if (cancel.CancellationToken.IsCancellationRequested)
        {
            errorDescription += " " + RestClientStrings.Error_CanceledByUser;
        }
        else
        {
            errorDescription += " " + RestClientStrings.Error_CanceledByTimeout;
        }
    }
}