BobaHoTep: Had the same problem not sure if they're exactly the same but look for post #7 at the bottom of that post. Also make sure the kobo is connected to the internet on wifi by opening the browser or something. You should be able to nmap the telnet port and get a response too when you get it working.
Code:
% nmap -n -p23 192.168.0.158
Starting Nmap 5.00 ( http://nmap.org ) at 2011-10-11 07:50 MDT
Interesting ports on 192.168.0.158:
PORT STATE SERVICE
23/tcp open telnet
Nmap done: 1 IP address (1 host up) scanned in 0.15 seconds
%
Code:
nmap -n -p telnet 192.168.0.158