Don't know if this this was already posted. Hopefully it helps someone else.
I started the ftp server on the 321 and everytime I tried to connect using filezilla was
Server sent passive reply with unroutable address. Using server address instead
Or using regular ftp from the browser it would say I don't have access.
But I could do a local connect by using 192.168.x.x and it would let me in. But using WAN it would not work.
I setup my router like this
I forwarded port 20/21 to the dns address example 192.168.1.10
also had to forward 1024 - 65535
Once I opened up both sets it started working. I guess the 321 uses pasv mode to connect which caused all my problems from the start.
Scotty