[Mile-Lile]

not sure... I'm not some IT expert... I think if you forwarded ports to IIS then IIS should handle traffic... maybe Per Yngve Berg could clarify this...
about beer thx:) This is how comunity works. I help you and you'll help someone else someday...

[seanvree]

Welp,

it was working for a couple hours, and now it's not. Again, only problem with PASV while the IIS server is connected to the OpenVPN server.

right now my settings are as follows:

Windows firewall OFF

IIS FTP listening on Port 21 (192.168.1.20). Can access from internal LAN.

DDWRT Port forwarding:
port 20 tcp&upd-> 192.168.1.20 port 20
port 21 tcp&upd -> 192.168.1.20 port 21
port 1024 tcp&upd -> 192.168.1.20 port 1024

Port Range forwarding 1024 - 65525 tcp&upd -> 192.168.1.20

Firewall comand:

iptables -I INPUT -i `nvram get wan_ifname` -p tcp --dport 20 -j ACCEPT
iptables -I INPUT -i `nvram get wan_ifname` -p tcp --dport 21 -j ACCEPT
iptables -I INPUT -i `nvram get wan_ifname` -p tcp --dport 1024: -j ACCEPT
iptables -I INPUT -m helper --helper ftp -j ACCEPT
iptables -I INPUT -m conntrack --ctstate RELATED -j ACCEPT
iptables -I OUTPUT -p tcp --sport 20 -j ACCEPT


Anything else I should try?