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.
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