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    <p>I don't know specifically what error you're getting when closing the stream, but in our application, we do a lot of large file uploads (videos and images). Here's how we write to our FTP stream:</p> <pre><code>request.KeepAlive = false; // This eliminated some of our stream closing problems using (Stream stream = request.GetRequestStream()) { stream.Write(file.Data, 0, file.Data.Length); } </code></pre> <p>I thought that doing a <code>using</code> block would effectively do the <code>Close</code> call on its own, but maybe it also performs other necessary cleanup. Also notice I turned off the FTP keepalives, which caused us problems in some of the third-party FTP sites we uploaded to.</p> <p>You really should look at the specific exception you're receiving rather than swallowing all exceptions. The error message will most-likely tell you what's wrong. The most common problems we encountered had to do with active vs. passive mode and the keepalives.</p> <p><strong>Edit:</strong></p> <p>To discover what was really going on when we had FTP issues with CDNs (and it happens way too frequently), we sometimes had to turn tracing on in our application. See <a href="http://msdn.microsoft.com/en-us/library/ty48b824.aspx" rel="nofollow noreferrer">this link</a> for details on how to enable tracing. Another option is to use a tool like Wireshark to sniff the conversation between your application and the FTP server. If you can see what's going in in the FTP protocol, you'll have a much better chance of resolving the issue.</p>
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    1. COThanks. In my code KeepAlive is false and I tried "using", but the code never comes out of "using" block. Regarding errors, I don't get any exception, which is making it difficult to track the problem.
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    2. COAre you using active or passive mode?
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    3. COAnd when you say "There is no exception as this part is within try-catch," are you saying that the catch block isn't getting reached or that the try/catch is masking your exception?
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