421 No Transfer TimeoutProblem
421 No Transfer Timeout (120 seconds): closing control connection. Connection closed.
The FTP server is set to log you off at the specified idle time limit.
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
keep alive, connection, timeout
How To keep a connection open
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