在windows server 2012 R2上发送http/2请求

我想在我的应用程序中使用APNs推送服务,因此我使用以下代码:

    var responseString = string.Empty;
    using (var request = new HttpClient(new Http2CustomHandler()))
    {
        var content = new StringContent(body);
        request.DefaultRequestHeaders.Add("authorization", $"bearer {authorization}");
        request.DefaultRequestHeaders.Add("apns-topic", topicName);
        if (!string.IsNullOrWhiteSpace(iD)) request.DefaultRequestHeaders.Add("apns-id", iD);
        if (!string.IsNullOrWhiteSpace(expiration)) request.DefaultRequestHeaders.Add("apns-expiration", expiration);
        if (!string.IsNullOrWhiteSpace(priority)) request.DefaultRequestHeaders.Add("apns-priority", priority);
        if (!string.IsNullOrWhiteSpace(collapseID)) request.DefaultRequestHeaders.Add("apns-collapse-id", collapseID);
        var result = request.PostAsync(url, content).GetAwaiter().GetResult();

        responseString = result.Content.ReadAsStringAsync().GetAwaiter().GetResult();
    }

在我的机器(windows 10)上工作正常。但当我在服务器(windows server 2012 R2)上部署应用程序时,它会引发以下异常:

System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.Http.WinHttpException: A security error occurred

有没有办法解决这个问题?