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[PGLion]

On my DIR-855 I have opened some ports using Virtual Server, but when testing these ports (http://www.dyndns.com/support/tools/openport.html) I found out they are still closed. So I activated DMZ but the ports are still closed. Why can't I open ports on this great router?

[lizzi555]

The machine you opened the ports for needs a static ip address.
Either assigned via static DHCP in the router menu or manually entered.

Are you using a software firewall on that machine.
This can also block the traffic, so check whether you allowed traffic on these
ports or for the appropriate programs.

[PGLion]

Thanks for helping lizzi555!

In fact the machine I want to open ports for is a NAS (eTRAYZ) and I assigned a static IP addres. I did DHCP Reservation in the router and in the NAS software I ticked 'static'. The internal IP is 192.168.0.100, my local IP is 83.65.100.83 (http://checkip.dyndns.org/).

Local I can do everything with my NAS but I can not connect to it from a remote location. To clarify this issue I have added some screenshots.