FtpWebRequest asynchronous Upload

Question

I am uploading file to FTP server asynchronously using the code listed in MSDN.
http://msdn.microsoft.com/en-us/library/system.net.ftpwebrequest.aspx

I give the server credentials, set  the mode and timeout. And in the callback (EndGetStreamCallback) it crashes at
requestStream = state.Request.EndGetRequestStream(ar);

with following exception
WebException: The remote server returned an error: (550) File unavailable (e.g., file not found, no access).

I looked at the FTP traffic b/w my application and site and observed
that the connection was a success but
it had Request: OPT utf8 on
Response: 550 Permission denied.
and the PWD (Print Working
Directory) was "/download/" and my since i gave a path "ftp://
ftp.xxx.com/upload/filename.txt" it then tries to change the
directory
with the command "CWD /download/upload/", since no such directory
exists remote sever reutrned the error mentioned in the above
exeption.

Please advise.

Thanks
SM

Answer 1

Shouldnt you make sure that the destination directory exists first, before trying to upload a file into that directory?

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feroze
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Answer 2

Directory is in place. Everything looks good.

If i login through a FTP Client (CoreFTP), it uploads smoothly. But there seems to be some issue with asynchronous upload through code.

Thanks

Answer 3

Run a Wireshark trace of the working FTP scenario and save it.  Then run the same trace (exact commands from working scenario) and compare the two traces.  You will see a differnce that will help you zero in on where things are going wrong.

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Javaman

Answer 4

FtpWebRequest assumes that the path in the URL is relative to the home directory on the FTP server.  To have it do a absolute CD "/foobar", then the path needs to have an extra slash at the front.  So you need to use e.g. ftp://ftp.xxx.com/%2Fupload/filename.txt Note the "%2F" See http://blogs.msdn.com/mariya/archive/2006/03/06/544523.aspx for the details!

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