试图上传到FTP: system.net.webeexception:系统错误

本文关键字：system net webeexception 系统错误 FTP | 更新日期: 2023-09-27 18:11:04

我有一个API，它接受XML并最终根据XML中的信息上传文件。上传是有时间表的(也来自XML)，我已经测试了它周围的一切，知道它是有效的。

我在每个时间周期中尝试上传的第一个文件上得到大约40%的时间错误(时间周期=某些文件45分钟，其他文件30分钟)。

下面是我上传的代码:

try {
    LoggerFTP.Log("Uploading file: " + filename, false);
    // Create the request.
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(appSettingsFTP.ftpUrl + @"/" + filename);
    request.Method = WebRequestMethods.Ftp.UploadFile;
    request.Timeout = 6000000; //set to 100 minutes
    //request.Timeout = -1; //set to infinite
    // Add the login credentials.
    request.Credentials = new NetworkCredential(appSettingsFTP.ftpLogin, appSettingsFTP.ftpPassword);
    // Grab the file contents.
    StreamReader sourceStream = new StreamReader(appSettingsFTP.uploadFileDirectory + filename);
    byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
    sourceStream.Close();
    request.ContentLength = fileContents.Length;
    // Copy the file contents to the outgoing stream.
    Stream requestStream = request.GetRequestStream();
    requestStream.Write(fileContents, 0, fileContents.Length);
    requestStream.Close();
    FtpWebResponse response = (FtpWebResponse)request.GetResponse();
    //Logger.Log(filename.ToString() + " " + "Upload Complete, Status: " + response.StatusCode + " " + response.StatusDescription, false);
    //Took response.StatusDescription out because it appears to be creating extra line feeds.
    LoggerFTP.Log(filename.ToString() + " " + "Upload Complete, Status: " + response.StatusCode, false);
}
catch (Exception ex) {
    LoggerFTP.Log(ex.ToString(), false);
}

我研究了这个问题，并在网上看到一些关于它可能是一个速度的事情。比如，有一个暂停。但我有我的超时设置为100分钟为我的FtpWebRequest，所以它不可能是吗?我不知道。这也是作为服务运行的，所以很难测试这方面的代码。

下面是在我的记录器(e.ToString)中记录的异常:

System.Net.WebException: System error. ---> System.Net.InternalException: System error.
   at System.Net.PooledStream.PrePush(Object expectedOwner)
   at System.Net.ConnectionPool.PutConnection(PooledStream pooledStream, Object owningObject, Int32 creationTimeout, Boolean canReuse)
   at System.Net.FtpWebRequest.FinishRequestStage(RequestStage stage)
   at System.Net.FtpWebRequest.SyncRequestCallback(Object obj)
   at System.Net.FtpWebRequest.RequestCallback(Object obj)
   at System.Net.CommandStream.Dispose(Boolean disposing)
   at System.IO.Stream.Close()
   at System.IO.Stream.Dispose()
   at System.Net.ConnectionPool.Destroy(PooledStream pooledStream)
   at System.Net.ConnectionPool.PutConnection(PooledStream pooledStream, Object owningObject, Int32 creationTimeout, Boolean canReuse)
   at System.Net.FtpWebRequest.AttemptedRecovery(Exception e)
   at System.Net.FtpWebRequest.SubmitRequest(Boolean async)
   --- End of inner exception stack trace ---
   at System.Net.FtpWebRequest.GetRequestStream()
   at CPMainSpringAPIExportsSC.UploadFTP.FTPUploadMethod(String viewname, String filename)

试图上传到FTP: system.net.webeexception:系统错误

我在试图通过SSL进行FTP传输的SSIS包中得到了完全相同的堆栈跟踪。在没有SSL的情况下工作得很好，但一旦启用SSL，它就会崩溃。

    System.Net.WebException: System error. --->
    System.Net.InternalException: System error.    at
    System.Net.PooledStream.PrePush(Object expectedOwner)    at
    System.Net.ConnectionPool.PutConnection(PooledStream pooledStream, Object owningObject, Int32 creationTimeout, Boolean canReuse)    at
    System.Net.FtpWebRequest.FinishRequestStage(RequestStage stage)    at
    System.Net.FtpWebRequest.SyncRequestCallback(Object obj)    at
    System.IO.Stream.Close()    at
    System.Net.ConnectionPool.Destroy(PooledStream pooledStream)    at
    System.Net.ConnectionPool.PutConnection(PooledStream pooledStream, Object owningObject, Int32 creationTimeout, Boolean canReuse)    at
    System.Net.FtpWebRequest.AttemptedRecovery(Exception e)    at
    System.Net.FtpWebRequest.SubmitRequest(Boolean async)
    --- End of inner exception stack trace ---    at
    System.Net.FtpWebRequest.CheckError()    at
    System.Net.FtpWebRequest.GetRequestStream()    at
    ST_0ff7348de65a468bb358ab0206e3721f.ScriptMain.Main() in c:'Users'Stephens'AppData'Local'Temp'Vsta'e664c8a71bb647ff9e9dc6ac32d7b615'ScriptMain.cs:line 155 at 
    System.Net.FtpWebRequest.CheckError()    at
    System.Net.FtpWebRequest.GetRequestStream()    at
    ST_0ff7348de65a468bb358ab0206e3721f.ScriptMain.Main() in c:'Users'Stephens'AppData'Local'Temp'Vsta'e664c8a71bb647ff9e9dc6ac32d7b615'ScriptMain.cs:line 155

因为这个错误是如此普遍，我决定查看。net源代码，看看我是否能抓住什么是错误的线索。如果你去这里:

http://labs.developerfusion.co.uk/SourceViewer/browse.aspx?assembly=SSCLI&名称空间= System.Net {% 22 pageclientstate % % 22 - 2844型% 2 3 22% ccsharp % 22}

并跳到第281行，您将看到内部void PrePush(对象expectedownner)的定义，它是在异常发生时执行的。如下图所示:

    internal void PrePush(object expectedOwner)
    {
        lock (this) {
            //3 // The following tests are retail assertions of things we can't allow to happen.
            if (null == expectedOwner) {
                if (null != m_Owner && null != m_Owner.Target)
                    throw new InternalException();
                // new unpooled object has an owner
            }
            else {
                if (null == m_Owner || m_Owner.Target != expectedOwner)
                    throw new InternalException();
                // unpooled object has incorrect owner
            }
            m_PooledCount++;
            if (1 != m_PooledCount)
                throw new InternalException();
            // pushing object onto stack a second time
            if (null != m_Owner)
                m_Owner.Target = null;
        }
    }

最后我发现FtpWebRequest只支持显式FTP(端口21)而不支持隐式FTP(端口990)。

是否。net FtpWebRequest支持隐式(FTPS)和显式(FTPS) ?

无论如何，在我的情况下，这是一个防火墙的问题。最初我们配置了隐式FTP，即端口989,990,49152-65535(根据供应商的技术人员)。我和我的网络人商量了一下，我们开放了端口20,21,989,990和400000 -655535，之后一切都很顺利。

然而，在您的情况下，您似乎有一些连接池兴奋正在进行。这里有一个关于这个主题的好帖子:

如何提高FtpWebRequest的性能?

你可能想看看你的连接池设置，看看你是否可以取得一些进展。希望这对你有帮助!

问候,斯图尔特

我知道这是一个古老的话题，但对于任何有同样问题的人来说，缺少的代码是:

            request.EnableSsl = false;
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