Hello Tony,
You can check your open server ports using the below command
# nc -z [hostname] [port-range]
i.e,
# nc -z localhost 1-4000
For load balancing you can probably use this command to check the number of incoming requests to your server
#netstat -ntlp | grep :80 | wc -l
This article will help you more in load balancing commands.
http://archive09.linux.com/articles/46735Hope that helped.