I've EP 7 with Usage Types AS Java, EPC, EP, BI Java, BP-ERP & XSS.
I am using fully qualified hostname by means of making entries in hosts file at OS level. I've also set icm/host_name_full parameter correctly.
Now when I enter URL as http://<fully qualified hostname>:<port>/irj/portal I am able to login to the system but after which if I try to navigate through any links under Employee Self-Service and Manager Self-Service for e.g. Employee Self-Service --> Benifits and Payment --> Request Claims, nothing happens. neither it throws any error nor does any page is displayed.
Same thing when I try without using fully qualified hostname like http://<hostname>:<port>/irj/portal it works absolutely fine.
I have done same settings as described above on my development as well as production system where it works absolutely fine with fully qualified hostname.