After some connection I have a 'not logged in' issue

Question

In my Web application I need to set path to two FTP folders and in model validation I try to check if these folders exists on the FTP server. My problem is that first time this usually works and the second time usually too. But the third time I have this error 'The remote server returned an error: (530) Not logged in.'

Here is my code:

try
 {
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri(model.configData.FTPInputFolder));
    request.Credentials = new NetworkCredential("ftp_free", "ftp_free");
    request.Method = WebRequestMethods.Ftp.ListDirectory;
    request.KeepAlive = false;

    FtpWebResponse response = (FtpWebResponse)request.GetResponse();
    /*response.Close();*/        
 }
 catch (WebException e)
 {
    ModelState.AddModelError("configData.FTPInputFolder", "Directory does not exist " + e.Message);
 }
 // second request for one other directory
 try
 {
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri(model.configData.FTPOutputFolder));
    request.Credentials = new NetworkCredential("ftp_free", "ftp_free");
    request.Method = WebRequestMethods.Ftp.ListDirectory;
    request.KeepAlive = false;

    FtpWebResponse response = (FtpWebResponse)request.GetResponse();

 }
 catch (WebException e)
 {
    ModelState.AddModelError("configData.FTPOutputFolder", "Directory does not exist" + e.Message);
 }

After some time everything becomes ok but after 2-3 validations (run this code) the "not logged in issue" comes back. What have I missed?

Moreover if I uncomment response.Close(); and if files are present in a folder (there are about 25 mb of files inside) it can hang at all. What's wrong here?

**Edit1: ** If I use PrintWorkDirectory instead ListDirectory it does not throw an exception whatever directory I check. At the picture is a response object of not existing directory on server

enter image description here

And here is response object of existing folder. It's totally the same... enter image description here

score 0 · Answer 1 · answered Apr 11 '13 at 20:34

0

First thing first, ListDirectory will list all the files in the folder which can be problematic when there are tons of files in the FTP folder. Try using:

PrintWorkingDirectory (alternatively GetDateTimestamp ). For the 'Not logged' error, try setting UsePassive to false. This has solved many 'Not logged' errors for me.

try
{
   FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri(model.configData.FTPInputFolder));
   request.Credentials = new NetworkCredential("ftp_free", "ftp_free");
   request.Method = WebRequestMethods.Ftp.PrintWorkingDirectory;
   request.KeepAlive = false;
   request.UsePassive = false;

   using(FtpWebResponse response = (FtpWebResponse)request.GetResponse())
   {}
}
catch (WebException e)
{
  ModelState.AddModelError("configData.FTPInputFolder", "Directory does not exist " + e.Message);
}

...

answered Apr 11 '13 at 20:34

rivarolle

1,528
11
18

Thanks for help. I tested this one 'WebRequestMethods.Ftp.PrintWorkingDirectory' but it does not work. In a result I see success everytime (I enter correct and incorrect path). As for 'GetDateTimestamp' - it always throw an exception 'The requested URI is invalid for this FTP command' with any folder I try to check – Vitalii Apr 11 '13 at 20:59
But with 'UsePassive=false' it seems that login issue is really disappear :) 50% is done :):):) – Vitalii Apr 11 '13 at 21:17
You can either compare the result of PrintWorkingDirectory with the expected folder. This will involve some string comparison I believe. Or keep using ListDirectory, but for lots of files, you will see a performance hit :) – rivarolle Apr 11 '13 at 21:36
Result is for existing folder is the same as for folder what does not exist. very strange that check is folder exists or not is so hard for ftp. ListDirectory works but performance hit is very very big, nobody wants to wait 5 minutes for model validation – Vitalii Apr 12 '13 at 04:39

score 0 · Accepted Answer · answered Apr 12 '13 at 15:49

Here is a solution what helped for me

try
{
   FTPOperations.ListDirectory(model.configData.FTPInputFolder, model.configData.FTPLogin, model.configData.FTPPassword);
}
catch (WebException e)
{
   FtpWebResponse response = (FtpWebResponse)e.Response;
   if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
   {
      ModelState.AddModelError("configData.FTPInputFolder", "Directory does not exists");
   }
   else
   {
      ModelState.AddModelError("configData.FTPInputFolder", "Directory check error: " + e.Message);
   }
}

And method

public static List<string> ListDirectory(string dirPath, string ftpUser, string ftpPassword)
{
   List<string> res = new List<string>();

   FtpWebRequest request = (FtpWebRequest)WebRequest.Create(dirPath);
   request.Method = WebRequestMethods.Ftp.ListDirectory;
   request.Credentials = new NetworkCredential(ftpUser, ftpPassword);
   request.KeepAlive = false;

   FtpWebResponse response = (FtpWebResponse)request.GetResponse();

   Stream responseStream = response.GetResponseStream();
   StreamReader reader = new StreamReader(responseStream);
   while (!reader.EndOfStream)
   {
      res.Add(reader.ReadLine());
   }
   reader.Close();
   response.Close();

   return res;
}

I'm not sure why it does not work before and if somebody shows this it will be very appreciated :)

Now this code works without login issues and also do not hang. Maybe it works now because we read resonce what we did not do before and close responce (without reading it hanged in past)

After some connection I have a 'not logged in' issue

2 Answers2