Now i am hosting successful over my TDSL6000 Con. Its right, that ur server isnt shown for urself in the ingame server list. But it is shown in LFSworld.net and u can connect urself from the same LAN with its local IP. Sometimes i get "Guest timed out", too - i think thats a latancy problem, perhaps someone know how to configurate a higher connection time tolerance (had this with GTR hosting 2, but found a way to change the settings there)
Setting ur Router to DMZ on the hosting machine is the best choice to solve all Port forwarding problems, i think - works fine for me.
...visit me on my server: KS GER FAIR RACE