I have a Toxikk server here that is running well so I know hardware isn't an issue for me, but will try to create different servers with varying settings that will hopefully yield similar results to what you describe...can see the server but not join it. This is assuming it isn't strictly a hardware issue and is something else that I can replicate here on my box.
Do you know the specific settings that are being used in your server's .ini file?
Hi Neo. I'm assuming you mean the serverconfiglist.ini?
I've checked it and there's nothing special about it.
I can only conclude that there's something on the firewall that is stopping the traffic getting through.