A SYST request asks for information about the server's operating system. The server accepts this request with code 215. EFT, and most servers, respond with 215 UNIX Type: L8:
Some clients disable essential features when they do not see particular strings in the SYST response. If your server requires a particular response, EFT provides an advanced property with which you can specify the value returned by the FTP SYST command. Refer to https://kb.globalscape.com/KnowledgebaseArticle10601.aspx for details.