There are commands like FEAT, REST issued after logging into FTP server but they failed. What do they mean?

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URL: http://www.tbsoftinc.com/support/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=93
Article ID: 93
Created On: 06 Jan 2006 02:14 AM

Answer The FEAT is to determine features that the FTP server supports. And the REST is to know whether the server supports download/upload resuming. Error responses to these commands can be safely ignored.