Is anything listening on port 8000? Not sure if they've fixed it for 4.3, but the 4.2 UF would also say after installation to connect on port 8000 locally.
You ask about firewalls, have you looked at the configuration of IPtables? "/sbin/iptables --list" will show the firewall rules currently in affect. You could also "/sbin/service iptables stop" or "/sbin/iptables --flush" to disable them temporarily
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