Its possible that you have to open port 34000 in iptables?
I think Gazelle use UDP ports because its like a XBT Tracker.
You have to executed the following command as root in a commandline tool like putty or on linux system use terminal.
Code:
iptables -A INPUT -p udp --destination-port 34000 -j ACCEPT
iptables -A OUTPUT -p udp --source-port 34000 -j ACCEPT
This will open incoming and outgoing udp port 34000.