How do I find out running processes were associated with each open port?
#sudo netstat -lpn |grep :8080
You will get an output similar to this one
tcp6 0 0 :::8080 :::* LISTEN 6782/java
The process i, which is 6782, now this is the process that is using port 8080.
Kill the process, type: kill 6782
# kill -9 6782
and now port 8080 is free.