@Marija, I add one thing I almost forgot this which I was reminded by " Feature request RUTX50: test FTP server connection posted by @Clipper87
it reminded me following thing I notice week ago.
When I use a security scanner like nmap (with frontend Zenmap GUI if you like) RUTX50 outside interfaces, it showed that FTP port (tcp/21) was being shown open ie. there is something that is listening that port which makes it look like it would be an open port.
Trying connection with telnet or nc does’t succeed, but regardless it’s not good to show as just appearing open port draws network scanning parties and random vulnerabilities poking attention, which is not a good thing. Thus ended up adding new firewall which is shown next screen capture. Name which I give it is perhaps not one you had used, but is good enough for me now.
I have done just quick general scans this far, nothing extensive yet. It would be worth you running complete scans at least with publicly available tools like Zenmap or script nmap check default configs what you ship devices.