FTP - `Name or service not know`

connection, ftp, lan

Solution

The `ftp` command does not support the `:5021` syntax for port numbers. Instead, there must be another way.

With some FTP clients, you can use a `-P` command line option:

ftp -P 5021 192.168.0.4

With others, you need to put the port number after the host address with a space:

ftp 192.168.0.4 5021

Use `man ftp` to see which yours supports.

Problem

I have an app, on my iphone, which allows me to transfer songs too and from my linux desktop via ftp. The app indicates that the host address is `192.168.0.4` and the port to be used is `5021`. I can connect fine to the device from filezilla but when I try to connect via the command line it fails with the error mentioned in the title. The command i'm using is `ftp 192.168.0.4:5021` but it fails. I'm totally stumped. When I search for help on the internet the answer is to simply do what I've done already. Does anyone have an any idea on what to do?

Original source