I am unable to forward ports to one particular computer on my network. Other computers work. What gives?

Question

I have tried different computers and different routers, but with each configuration, the same computer never works with port forwarding. Other computers on the network handle the forwarded ports without issue.

I am pretty sure it is an issue with Win XP Pro, but I am not sure where to look. I have disabled Windows Firewall, so that shouldn't be the problem. Any ideas?

I am very familiar with forwarding ports and have set it up successfully with several other computers on the network.

The computer I am having problems with is being assigned a static IP address.

Although I have tried a number of tests to verify that it is not working, I am relying mostly on the Azureus NAT testing tool.

I have trying forwarding several different ports to make sure that it wasn't a conflict problem.

This computer has actually worked in the past with port forwarding. So something must have been changed (perhaps from a Windows update?)

Answer 1

Assuming that you are configuring port forwarding through the router, are you having any trouble setting that portion up? What happens that you know the ports aren't being forwarded? Are you just getting no response, or have you actually used a network sniffer to see the traffic? Need more information....

Answer 2

Do you have a static ip, different from dhcp, for that computer, and so when you enter the info it is the right ip. Also check to make sure that ports are not afflicting with another cuz they could get mixed to go to another computer.

Answer 3

Is that computer normally works on your local network? IP address range and masks are same with others?

Answer 4

Port forwarding is administered by technique of the Router truly of a pc, so that is now unlikely to flow with you again living house, yet you are able to disable it by technique of a click of a button once you want to. to describe it slightly, port forwarding makes it so any site visitors coming in from "outdoors" your community (information superhighway / ISP), with a vacation spot port that you diverse, to flow to the wanted "inner" IP deal with (on your position), being your device. So in reality if enable's say you're installation a Minecraft server, in case you enable port forwarding for the Minecraft Server's port (which in effortless words that software makes use of) meaning if someone tries to connect to :25565 then it is going to continuously be directed on your pc. If that is in simple terms Minecraft then that is truly ok, I recommend in case you overwrote yet another port ahead rule that he already had in position for his own server then that ought to screw issues up (in which case you should in simple terms replace your port to something else then ahead that), notwithstanding if that is something fairly primary like say port 80 (that is HTTP), then that routes fantastically a lot each information superhighway-depending site visitors to one device that may actual screw issues up. So in reality, once you're port forwarding non nicely-frequently happening ports (that are >1024) that is okay yet once you're forwarding nicely-frequently happening ports (<1024) then you actual want to be careful. :)