[英]Attempting to upload to FTP: System.Net.WebException: System error
我有一个接受XML的API,并最终根据XML中的信息上传文件。 上传是按计划进行的(也来自XML),我已经测试了周围的所有内容,并且知道它可以工作。
在每个时间周期内尝试上载的第一个文件时,大约40%的时间出现错误(某些文件的时间周期= 45分钟,其他文件的时间周期= 30分钟)。
这是我上传的代码:
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);
}
我已经研究了这个问题,并在网上看到了一些可能是速度问题的信息。 就像有一个超时。 但是我将FtpWebRequest的超时设置为100分钟,所以可能不是吗? 我不知道。 它也作为服务运行,因此很难测试代码的这一方面。
这是我的记录器(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)
我在尝试通过SSL进行FTP的SSIS包中得到了完全相同的堆栈跟踪。 如果没有SSL,它会很好用,但是一旦启用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
由于该错误是如此普遍,因此我决定查看.NET源代码,以了解是否可以了解中断的线索。 如果您去这里:
并跳至第281行,您将看到内部void PrePush(object ExpectedOwner)的定义,该定义在发生异常时正在执行。 看起来像这样:
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;
}
}
最终,我发现FtpWebRequest仅支持显式FTP(端口21),而不支持隐式FTP(端口990)。 明确地在这里指出:
.NET FtpWebRequest是否支持隐式(FTPS)和显式(FTPES)?
无论如何,就我而言,这是一个防火墙问题。 最初,我们为隐式FTP配置了端口989、990、49152-65535(根据供应商的技术人员)。 我检查了我的网络人员,并打开了端口20、21、989、990和40000-655535,明确了这些内容,然后事情就如冠军一般了。
但是,就您而言,似乎似乎有些连接池令人兴奋。 这里有关于这个主题的好文章:
您可能想看看设置连接池的过程,看看是否可以取得一些进展。 希望这可以帮助!
问候,
斯图尔特
我知道这是一个老话题,但是对于任何有相同问题的人,缺少的代码是:
request.EnableSsl = false;
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