Question

I’m trying to upload a file to an FTP server using code based on this Microsoft Article

My code looks like this for testing purposes:

string ftpUrl = "ftp://" + ftpSite + ftpPath + "test.txt";
//string ftpUrl = ftpSite;

FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpUrl);
request.Credentials = new NetworkCredential(ftpUsername, ftpPassword);
request.Method = WebRequestMethods.Ftp.UploadFile;

StreamReader srcStream = new StreamReader(filePath);
byte[] fileContents = Encoding.UTF8.GetBytes(srcStream.ReadToEnd());
request.ContentLength = fileContents.Length;

Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();

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

Every time I try to upload the file, I get a “Filename not allowed” error back from the FTP server. If I use an FTP client application like WS_FTP, I’m able to FTP the same file just fine.

Any thoughts on how to correct this? I’ve already tried setting active/passive FTP mode, keepalive, and binary modes without any luck.

EDIT

This is a winforms application – the filename comes in from an OpenFileDialog prompt and the FTP address is based on settings in App.Config.

Answer 1

Without seeing your full code, I will say there is a very good chance the constructed FTP URL / path is incorrect, in comparison to what you expect it to be when you manually connect to the FTP site through a FTP client.

If you post your app.config code and how you assign values to ftpSite and ftpPath, it would be helpful in answering this question.