Ewon Flexy 205 PUTFTP with a different port than 21

Hi guys,
I’m trying to send a CSV file on FTP Server with port 2021 in passive mode , with the following command:

PUTFTP "/" + csvFName$, csvData$, $usr$ +":" + $pwd$ + "@" + $server$ + ":2021,1"

but I get th error

ftpc-Failed to open data connection in passive mode (port:2037)

but the strange thing is that if I try to send on the port 21 it works, but I need to send data on the specified port 2021.

Someone could help me?

Sorry for the delay. Can you please open a support case at support.hms-networks.com for this issue? They should be able to help you with it.