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Connection attempt times out in 21 seconds regardless of the /timeout option.
The Windows TCP/IP stack has a system wide retry delay and retry count for the initial connection. The default settings result in an overall 21 second timeout. This timeout is not software configurable so the /timeout option is only for timeouts in the protocol stream after the initial connection is made.
Instructions for changing this timeout system wide can be found here up to vista and server 2008:
For Windows 7 and Server 2008 R2 or higher
Article last updated: 2017-01-20
Tags: Robo-FTP, timeout, FTPLOGON