I am trying to configure my Balance 380 (Firmware 5.4.9 build 2573) for a secure FTP server (FTP with TLS/SSL). I have an entry for my FTP server under Inbound Access–>Servers. Under Inbound Access–>Services I created rules for TCP port 21 and TCP ports 3000-3050 and associated them with my FTP server. When I connect using regular/insecure FTP, it works as expected. When I connect using secure FTP, the connection times out.
If I modify my rule under Inbound Access–>Services to allow TCP ports 1 through 3050 for my FTP server, then I can connect with secure FTP. The developer of my FTP server software thinks that the Peplink is not forwarding traffic to ports 3000-3050 with my original set of rules (see paragraph above). Is the developer correct? If so, how do I go about configuring my Balance 380 so that I can access my FTP server securely without opening all TCP ports from 1 through 3050?
Thanks for reading!