vern@2010-01-10:/usr% ls tags

java.net.SocketException: Network is unreachable

RT @http://tinyurl.com/ydp8tag

1. edit /etc/sysctl.d/bindv6only.conf
2. change value net.ipv6.bindv6only=1 into 0
3. invoke-rc.d procps restartp. 

RT @http://tinyurl.com/yccgu9m

Adding the extra flag "-Djava.net.preferIPv4Stack=true" fixed the issue. Netflow now starts correctly.