Server sent passive reply with unroutable address. Using server address instead

sominaik wrote:

 I receive " Server sent passive reply with unroutable address. Using server address instead" And it shows up the external Ip address of Router 2 …

Because, by definition, IP’s in the range 10.x.x.x are unrouteable on the internet.

I would assume that Router 1 (the Internet-facing router) would need to run an FTP ALG in order to prevent that error.