I typed “55000” in the “start port” and the other two (“final port” and “destination port”) where auto-filled so… looks I have to type a different number somewhere but… where? and… which number?
Check what number it gives you. Maybe 55000 is already used by something else. In my case It gave me 55002. (You can use any number between 10000 and 65000 as long as it is not used by other stuff)
as I wrote… DMZ is only set on my ISP’s modem/router (to avoid double NAT)
my own router, which follows in the chain and is the one and only “thing” connected to my ISP’s one, does all the firewalling
Well, maybe I didn’t express myself well enough, hehe.
What I meant was, just try not to use it. In my case, DMS is also set up on my ISP modem or better said: the DMS address exists. But I’m not using it in my second modem. I think it’s kinda normal that your ISP provides an address for DMZ. It then only depends on what you do with it…