i have 2 servers with port forwarding installed server 1 is at ip address 192.168.1.1 and the second server is 192.168.1.3
and i am trying to forward so when i go to 
www.site1.com:8080 it goes to the second server behind the first server
this is the settings i used
Protocol Ext Port Dest IP Address Dest Port 
TCP       8080     192.168.1.3         80 
but it doesn't seem to wor what am i doing wrong.
cheers