I got exactly the same problem here.
My UT3 server including the latest update (ut3-linux-server-02202008.bin) running on a freshly installed Ubuntu Server 7.10.
The only difference is that this server is not in a DMZ, it's running in a VMware virtual machine.
Web admin works good, game shows up in game search but is holding on 'Connecting...' status.
When i look at the firewall status at the host I receive the following uitput so the firewall isn't blocking anything. Someone got a clue?
Code:
root@mediaserver:/etc/init.d# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
root@mediaserver:/etc/init.d#