I have 2 DNS-321's behind a DIR-825. The first has port 21 forwarded (Vertual Server) and works fine. The 2nd one is using port 4021 is forwarded and connects but returns the following while using a Filezilla client;
USER Mike
Response: 331 User Mike OK. Password required
Command: PASS ************
Response: 230 OK. Current restricted directory is /
Status: Connected
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 (192,168,0,175,29,34)
Status: Server sent passive reply with unroutable address. Using server address instead.
Command: LIST
Error: Connection timed out
Error: Failed to retrieve directory listing
I think It appears the DNS-321 is returning a unroutable address and needs to be set to return the external IP how can this be done.