Server on Linux not working when accessing from Filezilla on Windows

[proofrock]

Hi, I'm testing MinimalFTP under Linux (x86-64, Arch Linux, JVM 10.0.2) and it doesn't seem to work when accessing it from Filezilla. I thought it was my app, but the minimal code example in your README doesn't work either.

Please note that:

• it doesn't work with Filezilla (remote), but the standard linux "ftp" commandline client (localhost) works fine
• running the server under windows and accessing it with Filezilla (locahost) works
• running the server under windows and accessing it with the linux "ftp" util (remote) works, as well
• either server works accessing it from Firefox (both remote and localhost; read only, of course)
• it doesn't seems to be the case that "localhost works, and everything else don't" (also: no firewall, local LAN)
• no errors on the console (is there a way to "step up" the logging level?)

This is the Filezilla log:

Command: PWD Response: 257 "/" CWD Name Command: TYPE I Response: 200 Type set to I Command: PASV Response: 227 Enabled Passive Mode (127,0,0,1,146,245) Command: MLSD Response: 150 Sending file information list... Error: Data connection can't be estabilished. ECONNREFUSED - Connection refused by the server

(I translated from italian, sorry for any imprecision).

Thanks,

--Germano

[Guichaguri]

The problem is probably firewall. You're using passive mode, which picks a random port to start a server. Try setting FileZilla to use active mode instead.

[proofrock]

Hmmm... interesting. There was a firewall, and disabling it does the trick in active mode. In passive mode, same error message even when disabling the firewall (and also running the server as root). I'll use active mode for now, do you know how can I test passive mode ports?

[Guichaguri]

I use Java's automatic port allocation, which picks a random port from an ephemeral range.

I can add an option to disable passive mode in the server, so clients such as Filezilla will automatically pick active mode.

[proofrock]

Would be nice, but don't sweat on it. If you feel like doing it - thanks a lot. No pressure. :wink: