How to configure my router to forward passive FTP to my IIS server?

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http://serverfault.com – I'm trying to configure IIS 7.5 FTP service on a network that is hidden behind a firewall / NAT. The communication should look like this: client (FileZilla) <--> router (NAT, firewall) <--> Win2008r2 (IIS + FTP) As I understand it I should aim for passive connection - or at least that is what FileZilla or Total Commander use automatically. I can now successfully log in to my FTP server given an IIS Manager user that I've configured, however, I can't work with the data, e.g. the LIST command will fail with "connection timed out, failed to retrieve directory listing" etc. I think (HowTos)