If that does not work try
If that also does not work then physically go to the console / monitor of the server isupport-4iapps and use the URL
http://isupport-4iapps:8080/apex/apex Workspace = INTERNAL User = ADMIN Password = <admin passwd that you set while installing with the apxchgpwd.sql script>
If that also does not work then try without the /apex
http://isupport-4iapps:8080/apex or http://localhost:8080/apex
What do you see? If you still get 404 then most probably your database is not running.