XCalibre only support SSH to access the servers, Telnet is not supported as it is an insecure protocol. By default SSH access is switched off for security reasons. If you do require SSH access please email firstname.lastname@example.org to request this access and let us know what you are wanting to use SSH for, all requests are subject to our approval.
SSH access to XCalibre servers poses a security risk. In the past people who have had SSH access haven't kept secure practices, mainly through poor password choice, and this has lead to their SSH accounts being compromised. If an SSH account is compromised, the unauthorised user then has the chance to escalate their privilages on the server by searching for security weaknesses and attempting to exploit them. For these reasons the SSH access to our servers is only granted to customers who wish to perform tasks that cannot be performed via FTP. Tasks such as changing file permissions (using CHMOD), moving files, renaming files, unzipping (also untarring) files and setting up password protected directories are all things that can be done with FTP clients (and PHP/Perl scripts).
You can download an SSH program or ‘client’ like PuTTY (a free SSH client for Windows), you can obtain this from the PuTTY Website at: http://www.chiark.greenend.org.uk/~sgtatham/putty/