Port Forward

Hey,

I need to ask some thing i was trying to port forward my router at 1st

I though it is some thing wrong with my Linux Firewall but then i asked my ISP and he Replied they Don't Allow Port Forwarding. I don't think is it's possible But when i try to Port Forward with Windows still didn't get any success at all even if i disable my firewall. Do you have any idea about whats going on so let me know

-LiGHTNinG