You could use tcpdump
or if you have a gui installed use wireshark
If you're brave you could write some iptables
rules and tail -f
iptables -I INPUT -s remote.host.ip.1 -j LOG --log-ip-options
iptables -I OUTPUT -d remote.host.ip.1 -j LOG --log-ip-options
Also make sure that the services are listening on the outbound interface and not localhost. Use netstat -tulpn
to see where and which process are listening.