According to this article:
All these ports are required to be opened but when running some telnet commands no connection can be established.
Identity Manager: 8080
Identity Manager: 8443
telnet localhost 8080
telnet: connect to address 127.0.0.1: Connection refused
Release : 14.4
Component : IdentityMinder(Identity Manager)
This is caused due to improper configuration of the telnet command. Since components such as IP, IM, and IG are all started through an application server that has an IP configured in the startup parameters then the telnet command must either include the FQDN or the IP address as localhost will not work.
telnet 10.10.100.10 8080
You can also use netstat commands on the local machine to check all open connections:
netstat -anp|grep 8080
netstat -anp|grep 8443