Port Forwarding doesn't work even though I did everything properly

I am trying to set up a server that went down after I tried a different way of hosting it with a program that messed everything up and when ever i try forwarding any port, even though I know how, I do everything I need to do and I check if my port is open on canyouseeme.org and it shows up as no route to host. Is there a firewall in the airport i need to disable for it to work?

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WRT120N - DMZ works, port forwarding doesn't work; only one device allowed in DMZ

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I have an WRT120N router and two DVRs. I can get either one of the DVRs to work just fine if I put it in the DMZ. Neither one works when I enable port forwarding. Since I cannot have two devices in the DMZ with this router, I cannot use that approach (throwing them in the DMZ) as a viable solution.
I need help finding out what I am doing incorrectly with the port forwarding. Basically I am creating an entry for each port of each device, going to the correct IP address of that device. I have tried both protocols as well as just TCP. This does not work. Just for fun, I tried using the port range forwarding and this does not work either. The only thing that works is if I throw either of the devices in the DMZ.
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So either I am doing something wrong, or there is a need for a router software update, or the router is blocking some other protocol, etc. Help is much appreciated! BTW, tried with the router firewall off, too. No go.
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Port Forwarding doesn't work even though I did everything properly

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