FTP port forwarding to My Cloud Nas
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I'm trying to set up port forwarding for FTP to my NAS. On the old router I was able to put more ports in the port range to forward. i.e. 21,55536-55663. This router doesn't allow that as the fields aren't big enough and even when I shortened the ports down to 21,536-663 it changed it to 21-663 and didn't work. The NAS only supports passive mode so if I forward port 21 only it will log in but will time out trying to display the folder list. It's not forwarding the data ports which by default are 55536-55663. It will work if I put it in the DMZ but that's not a good solution obviously. I have two FTP servers running anyway so I need to get this figured out so both will work.
If I leave the port empty it just autopopulates with whatever the external port is set to. It will connect but won't retrieve directory listing.
Status: Connecting to x.x.x.x:21...
Status: Connection established, waiting for welcome message...
Status: Initializing TLS...
Status: Verifying certificate...
Status: TLS connection established.
Status: Server does not support non-ASCII characters.
Status: Logged in
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is your current location
Command: TYPE I
Response: 200 TYPE is now 8-bit binary
Command: PASV
Response: 227 Entering Passive Mode (x,x,x,x,x,61)
Command: MLSD
Error: Connection timed out after 20 seconds of inactivity
Error: Failed to retrieve directory listing
Great job. 
That is what I meant in my very first reply if you want to open a port range, the internal port should be blank.