So, I did a wireshark on the server while attempting to connect. I can see all the login server packets on udp 5999 go through fine, and then the conversation switches to udp 9000 and seems to go fine until I start to see some port unreachable ICMP messages on udp 9000 start to appear. These show up at the same time that (observationally anyway) the UF client dumps me back to the login screen.
This probably does not shed much light as this is probably what one would expect to see at the packet level when a disconnect occurs between server and client.
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