Copy files on the same FTP server

[Nobel]

Hi

I have a Synology NAS server on my LAN and I can in FlashFXP log on to the drive using FTP on the left and on the right site on the same time. I then can move/copy files from one folder to another on the Synology server.

When I then log on my Synology NAS server on my office (via the internet) and try the same, the process stops, just after I has startet. (se log)
I have in the firewall open port 20-21 and 55536–56559 and can use the Synology NAS server fine to copy to and from via FTP to my PC, but the “intern” work where I move files from one folder to another on the Synology NAS server dose not work.

In this exempel I try to copy the file aawsepersonal.exe from one folder to another. But the process stops after STOR… the file aawsepersonal.exe is made but is 0 kb.

What can be the problem?

Regards
Nobel

log:

[L] CWD /Test
[L] 250 CWD command successful.
[L] PWD
[L] 257 "/Test" is current directory.
[R] TYPE I
[R] 200 Type set to I.
[L] TYPE I
[L] 200 Type set to I.
[R] PASV
[R] 227 Entering Passive Mode (80,165,xxx,xxx,48,246)
[L] PORT 80,165,xxx,xxx,48,246
[L] 200 PORT command successful.
[L] STOR aawsepersonal.exe

[bigstar]

A hardware device or software program between you and your NAS server is blocking the site to site transfer. This can occur with NAT (Network Address Translation) based solutions, NAT is not site to site friendly.

To overcome this problem you may need to run the FTP server on a non-standard port. Normally FTP is on port 21 but if you were to use say port 2034 that should prevent NAT from causing problems.

Using a secure connection (AUTH SSL/TLS) is another option.

If neither of these options are possible one other option would be to run a socks proxy on your home network. Then configure FlashFXP to use the socks proxy when connecting to your NAS from the office.

[Nobel]

To overcome this problem you may need to run the FTP server on a non-standard port. Normally FTP is on port 21 but if you were to use say port 2034 that should prevent NAT from causing problems.

Hi

Thank you for the quick reply. I changed the port number from 21 to 2021, and that have solved the problem.
Thanks for the help.
Regards

Nobel