Running my game server on my inside network, not being seen on internet (Cisco 2600)

I am running a game server on my internal lan, this is working correctly and works on the internet if I plug my PC in directly. I think the problem is due to NAT running on my cisco 2600 (config below). Because when I use my router, it isn't being seen on the list of internet servers as it should. What do I need to add to my config to allow it to be seen on the net.

The port my game uses is 14567 and the local IP is: 192.168.137.2
The IP address that my router picks up is 80.0.159.27

Any help would be much appreciated.

Thanks
James

Current configuration : 1301 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
!
ip subnet-zero
!
!
ip domain round-robin
!
no call rsvp-sync
!
!
interface Ethernet0/0
 description outside DHCP DSL interface
 mac-address 0002.a560.b487
 ip address dhcp
 ip access-group 100 in
 ip nat outside
 no ip mroute-cache
 no keepalive
 half-duplex

interface Ethernet0/1
 description Inside static Interface to my LAN
 ip address 192.168.137.254 255.255.255.0
 ip nat inside
 full-duplex
!
ip nat inside source list 1 interface Ethernet0/0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Ethernet0/0
no ip http server
!
!
access-list 1 permit 192.168.137.0 0.0.0.255
access-list 100 permit ip any any
!
dial-peer cor custom
!
!
!
line con 0
line aux 0
line vty 0 4
 timeout login response 300
 password
 login
!
end