实时会话转录遇IOException/SocketException错误，求控制台程序解决方案

调试实时会话转录功能时遇到以下错误：

IOException: Unable to write data to the transport connection: An existing connection was forcibly closed by the remote host.
SocketException: An existing connection was forcibly closed by the remote host.

提供的C#控制台程序代码如下：

public static async Task TranscribeConversationsAsync(string voiceSignatureStringUser1, string voiceSignatureStringUser2)
{
    var filepath = "Tech.wav";

    var config = SpeechConfig.FromSubscription(VoiceGenerator.subscriptionKey, VoiceGenerator.region);
    config.SetProperty("ConversationTranscriptionInRoomAndOnline", "true");

    // en-us by default. Adding this code to specify other languages, like zh-cn.
    // config.SpeechRecognitionLanguage = "zh-cn";
    var stopRecognition = new TaskCompletionSource<int>();

    using (var audioInput = AudioConfig.FromWavFileInput(filepath))
    {
        var meetingID = Guid.NewGuid().ToString();
        using (var conversation = await Conversation.CreateConversationAsync(config, meetingID))
        {
            // create a conversation transcriber using audio stream input
            using (var conversationTranscriber = new ConversationTranscriber(audioInput))
            {
                conversationTranscriber.Transcribing += (s, e) =>
                {
                    Console.WriteLine($"TRANSCRIBING: Text={e.Result.Text} SpeakerId={e.Result.UserId}");
                };

                conversationTranscriber.Transcribed += (s, e) =>
                {
                    if (e.Result.Reason == ResultReason.RecognizedSpeech)
                    {
                        Console.WriteLine($"TRANSCRIBED: Text={e.Result.Text} SpeakerId={e.Result.UserId}");
                    }
                    else if (e.Result.Reason == ResultReason.NoMatch)
                    {
                        Console.WriteLine("NOMATCH: Speech could not be recognized.");
                    }
                };

                conversationTranscriber.Canceled += (s, e) =>
                {
                    Console.WriteLine($"CANCELED: Reason={e.Reason}");

                    if (e.Reason == CancellationReason.Error)
                    {
                        Console.WriteLine($"CANCELED: ErrorCode={e.ErrorCode}");
                        Console.WriteLine($"CANCELED: ErrorDetails={e.ErrorDetails}");
                        Console.WriteLine("CANCELED: Did you set the speech resource key and region values?");
                        stopRecognition.TrySetResult(0);
                    }
                };

                conversationTranscriber.SessionStarted += (s, e) =>
                {
                    Console.WriteLine($"\nSession started event. SessionId={e.SessionId}");
                };

                conversationTranscriber.SessionStopped += (s, e) =>
                {
                    Console.WriteLine($"\nSession stopped event. SessionId={e.SessionId}");
                    Console.WriteLine("\nStop recognition.");
                    stopRecognition.TrySetResult(0);
                };

                // Add participants to the conversation.
                var speaker1 = Participant.From("User1", "en-US", voiceSignatureStringUser1);
                var speaker2 = Participant.From("User2", "en-US", voiceSignatureStringUser2);
                await conversation.AddParticipantAsync(speaker1);
                await conversation.AddParticipantAsync(speaker2);

                // Join to the conversation and start transcribing
                await conversationTranscriber.JoinConversationAsync(conversation);
                await conversationTranscriber.StartTranscribingAsync().ConfigureAwait(false);

                // waits for completion, then stop transcription
                Task.WaitAny(new[] { stopRecognition.Task });
                await conversationTranscriber.StopTranscribingAsync().ConfigureAwait(false);
            }
        }
    }
}

排查方向与解决建议 #

• 验证语音签名有效性：确认传入的两个语音签名是通过官方流程生成的有效字符串，签名对应的语言必须和代码中指定的en-US完全匹配，无效或不匹配的签名会触发服务端主动断开连接。
• 检查音频文件格式：确保Tech.wav符合Azure语音服务的要求：PCM 16位编码、采样率16kHz、单声道或立体声，格式不兼容会导致服务端无法处理音频流，进而强制关闭连接。
• 核对区域与网络配置：确认VoiceGenerator.region与你的Azure语音资源所在区域完全一致；检查网络环境是否允许WebSocket连接（语音服务依赖WebSocket传输实时数据），防火墙、代理或VPN可能拦截连接导致中断。
• 修复异步代码阻塞问题：代码中使用Task.WaitAny属于同步阻塞操作，可能破坏异步流程的上下文，建议替换为await stopRecognition.Task，避免因线程阻塞引发的连接异常。
• 检查服务配额与限制：查看Azure语音资源的配额是否耗尽，会话时长是否超过服务端限制（默认单会话有时间限制），超出限制会被强制断开。
• 更新SDK版本：确保使用的Azure Speech SDK是最新稳定版，旧版本可能存在已知的连接兼容性Bug，更新后可解决部分连接问题。

内容的提问来源于stack exchange，提问作者edu