Simply edit the file /etc/securetty and add the following to the end of the file:
pts/0
pts/1
pts/2
pts/3
pts/4
pts/5
pts/6
pts/7
pts/8
pts/9
This will allow up to 10 telnet sessions to the server as root.
Configure FTP for root logins
Edit the files /etc/vsftpd.ftpusers and /etc/vsftpd.user_list and remove the ‘root‘ line from each file.
Make sure that you NEVER configure your production servers for this type of login.
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source:http://linuxpoison.blogspot.com/2008/02/135781758010894.html