I just set up FTP on my Windows Server 2003 box with a port number of 4465 for FTP commands. (It's not 21.) I can access the FTP home directory using the server itself (127.0.0.1) or any workstation in my LAN. I'm having trouble, however, accessing the server from the WAN. I've opened up my DSL router firewall for TCP ports 20 (FTP data) and 4465. Here's the message I get when I try to access my new FTP server from a remote machine using Filezilla:
Status: Retrieving directory listing...
Response: 257 "/" is current directory.
Command: TYPE I
Response: 200 Type set to I.
Response: 227 Entering Passive Mode (192,168,1,2,6,212).
Status: Server sent passive reply with unroutable address. Using server address instead.
Response: 425 Can't open data connection.
Error: Failed to retrieve directory listing
I'm clearly "getting in the door." The 192,168,1,2 value is the static IP of my server on the LAN. Note the subsequent response, however: "Server sent passive reply with unroutable address. Using server address instead."
My ISP does have a firewall in place for port values under 500. Am I running into this firewall for port 20?
Is it something else?
What diagnostics can I try?