Multiplayer Hosting Port Issue

[I/KG26_Fish]

S!
I am trying to open up certain ports to host multiplayer games on the internet on my computer and on Xbox 360.

The only internet service provider is primecast. I am able to open the ports on my router but the ports still show closed using portforward.com portchecker. I disabled all firewalls and Anti-Virus, no luck. I even connected my computer directly to the modem, the ports are still closed. The Router is a Linksys WRT400N set to single band. The modem is an Alcatel although there is no model number (it has a fiber optic connection, coax connection and 2 ethernet port connections). The condo is cat 5 ready so the router has multiple ethernet cables which go to the ethernet wall plugs throughout the apartment which is how I connect to my desktop.

Do you think you can help me with this problem?

Sincerely,

Fish

Win 7 x64
Intel I5 750 1186
12 GB Ram
1.5 Tb HDD in Raid Striping
ATI Radeon HD 5770

[Deleted]

I noticed that you have port range forwarding open.
Could it be that you're supposed to set it in the single port forwarding section?

or..

About a month ago, I was having the same problem. The problem for me was that every time we booted the pc's in a different order, the last digit of my ip would be different. A .102 opposed to when I set it for .101. So, I opened the port twice, so both ips were set to allow 21000.

Just my two cents..
I'm no guru.