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Created 12 Apr 2002
Modified 12 Apr 2007
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421 No Transfer Timeout

Problem

421 No Transfer Timeout (120 seconds): closing control connection. Connection closed.

Cause

The FTP server is set to log you off at the specified idle time limit.

Solution

You can try adding a few commands to the SmartFTP Keep Alive feature to help you stay connected. For more information, please read the following knowledge base article.
KB: How To keep a connection open

Keywords
keep alive, connection, timeout

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How To keep a connection open