Unable to connect to FTP - Connection timeout after MLSD

According to the FileZilla admins, your router is probably the issue (even though you probably can't do anything about it), and they're not going to fix it to fall back to LIST if MLSD times out. See: http://forum.filezilla-project.org/viewtopic.php?f=2&t=11405&start=15

Solution: Try Core FTP or similar. It's unlikely you'll be able to convince the stubborn FileZilla folks to add a (stupidly simple) workaround option- "fall back to LIST if MLSD times out".

Or, since it's open source, see if you or someone else can make the change and compile it yourself. I imagine if you try to submit the change to be added to the official build, they'll reject it, but perhaps we could be pleasantly surprised.

After a long search, the solution was simple:

Go to Site Management, choose the site with the problem. Choose tab Transfer Settings and select Active instead of Default.

I found the problem in Encryption when I changed it to "Only use plain FTP (insecure)" then its working perfectly!

FileZilla is very familiar to me and I need to fight for bugs every update of it.

I fixed the problem by using a ssh tunnel through one of my personal server. I am absolutely stumped as to why this would work. I'm currently in Japan, and my server in Canada, so perhaps there is an issue with IPv6 address (even though the server says it shouldn't)...?