TCP/IP-Information: Protocol TCP Port 8023 outbound or Protocol TCP Port 8024
Click telnet://db0fhn.efi.fh-nuernberg.de:8023 and Login with Username and/or SSID (can be 0 to 15) and your password.
If your password will not be accepted by DB0FHN you maybe use wrong Telnetsettings. Please use RAW-Mode (e.g. Putty) for Connection.
Sample from a Windows XP machine.
Settings for Putty.