issue with NetFlow

Hey guys,

i've just dowloaded ManageEngine NetFlow Analyzer pro and i can't get any of our routers to come up on the dashboard. i beleive that we got a firewall inside out network that may be blocking the traffic. We are Ruing ISA server 2006 and our CISCO router is 1841. I have entered the following commands:

interface FastEthernet 0/1
ip route-cache flow
exit
ip flow-export destination 10.1.1.93 2055
ip flow-export source FastEthernet 0/1
ip flow-export version 5

Have i missed anything? do i need to add something to ISA server? Just so that you know, i change the port setting durning the setup so i don't think that would be the issue

Thanks