Yes it is possible but there are many good reasons for not doing it. If there is no other way around it, you will need to edit each server's config file. For the most part, you wil find a sub-directory or .conf file in /etc/ with the servers name.
If you are using ssh there is no reason to use telnet. You are better off using ssh and it's the one most prefered. OpenSSH sets 'PermitRootLogin = yes' by default. If it isn't allowing root loging, open/etc/ssh/sshd_config and change it or remove the '#' in front of it to uncomment the line.
You haven't mentioned which ftp server you are running.
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