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    <p>UploadFile uses STOR command, but before this command is sent, .NET sometimes send other commands such as "OPTS utf8 on" or "TYPE I", etc. If you create configuration file for your application with following content:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;configuration&gt; &lt;system.diagnostics&gt; &lt;sharedListeners&gt; &lt;add name="console" type="System.Diagnostics.TextWriterTraceListener" initializeData="c:\logfile.txt" /&gt; &lt;/sharedListeners&gt; &lt;sources&gt; &lt;source name="System.Net" switchName="sourceSwitch"&gt; &lt;listeners&gt; &lt;add name="console" /&gt; &lt;/listeners&gt; &lt;/source&gt; &lt;/sources&gt; &lt;switches&gt; &lt;add name="sourceSwitch" value="Verbose"/&gt; &lt;/switches&gt; &lt;/system.diagnostics&gt; &lt;/configuration&gt; </code></pre> <p>all commands and responses will be logged in file, so you can look, which one causes the problem.</p> <p><strong>UPDATE:</strong> So the problem is, that before STOR command is issued, FTP client sends OPTS and PWD commands, which your printer doesn't understand, probably because it is very lightweight FTP server. Unfortunately I don't know how to prevent these commands to be send. I have only 2 workarounds on my mind:</p> <ul> <li>find some third-party FTP library, that doesn't send those problematic commands.</li> <li>since uploading files from command line works, create file (commands.txt) with appropriate 'put' command and then start FTP transfer from your program like this:</li> </ul> <p><code>Process.Start("ftp", "-A -s:commands.txt " + printer.m_IPAddress);</code></p>
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    1. POError trying to use C# ftpwebrequest to ftp xml file to Zebra printer
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    1. COOK, I ran the TRACE as you suggested and this is what was logged:
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    2. COWhat was logged? I don't see anything.
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    3. COHere was the output: System.Net Verbose: 0 : [4780] FtpWebRequest#14993092::GetRequestStream() System.Net Information: 0 : [4780] FtpWebRequest#14993092::GetRequestStream(Method=STOR.) System.Net Information: 0 : [4780] Associating FtpWebRequest#14993092 with FtpControlStream#720107System.Net Information: 0 : [4780] FtpControlStream#720107 - Received response [220 ZBR-46688 Version 1.01.7 ready.] System.Net Information: 0 : [4780] FtpControlStream#720107 - Sending command [USER anonymous] System.Net Information: 0 : [4780] FtpControlStream#720107 - Received response [230 User logged in.]
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