I followed the instructions in the following thread http://forums.oztivo.net/showthread.php?t=959 and edited my tclient.conf file in line with that. I still had connection problems not because of the issue you have, but because the cachecard was not configured by default in the nzThomson image (turbonet is default I believe) and it worked fine for me once I configured the cachecard.
Did you run the turbonet setup and have it configure your card (ie static IP address, subnet, gateway etc)
If you edit your tclient file in line with the above post, and your turbonet card is configured correctly, you shouldn't have a problem.
Can anyone else help further as I am no expert on this......by any means. Keep us up to date on your progress finethen.