Hi Nils,
...Can you connect to the server using other FTP programs or do you get a similar error?..
I use Total Commander and Filezilla and Winscp on the same machine for FTP without any problem.
About NAT/Router I have to confess, what might be difference to usual setups, there are
several cascading NAT-Routers. But all other applications see this as completely transparent
and do not require special setups or actions. But, I tried this for curiosity only! Most important,
passive mode works fine (beside the resume thing)!
Jockel