n I/O error occurs while either sending a
  command to the server or receiving a reply from the server.</dd>
<dd><code><a href="../../../../../org/apache/nutch/protocol/ftp/FtpExceptionBadSystResponse.html" title="class in org.apache.nutch.protocol.ftp">FtpExceptionBadSystResponse</a></code></dd></dl>
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<h4>sendNoOp</h4>
<pre>public&nbsp;boolean&nbsp;sendNoOp()
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