Q. I have determined that NetFlow packets are arriving at the server, but I do not see any data displayed. I have checked the firewall settings and nothing is blocking port 2055 on the server.

A. Check to see if the ns2flows process is only listening on IPv6 sockets and not listening on IPv4 sockets. If that is the case, disable IPv6 on the Linux host and restart both intermapperd and ns2flows.