Q. How do I telnet as the root user?

A. This is really a bad idea as telnet is insecure, because passwords are sent as clear text format. Instead, you should use SSH for connections. I suggest that you use SSH to connect to a system instead of Telnet for security purposes. By default, for security purposes, the root user can not telnet. However, here is method in case you need root access via telnet:

Edit /etc/pam.d/login and /etc/pam.d/remote files using a text editor such as vi. Find the line that read as follows:

auth       required     pam_securetty.so

Comment it out by prefixing # symbol:

#auth       required     pam_securetty.so

Save and close the file. Now, you should be able to telnet to your system as the root user.

原文取自 http://www.cyberciti.biz/faq/how-do-i-telnet-as-the-root-user/ 



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