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This article introduces the relevant knowledge of "how to connect to the LINUX server with root identity". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

It is recommended that users log in to the server remotely using a secure ssh rather than telnet, because when telnet connects to the server, the password is transmitted in clear text. Therefore, the default root does not allow telnet to log in directly to the server.

This article assumes that you have installed the telnet-server package, configured it correctly, and have port 23.

If you want to force root to connect to the server through telnet, you can modify / etc/pam.d/login. The default file is as follows:

#% PAM-1.0

Auth required pam_securetty.so

Auth required pam_stack.so service=system-auth

Auth required pam_nologin.so

Account required pam_stack.so service=system-auth

Password required pam_stack.so service=system-auth

Session required pam_stack.so service=system-auth

Session optional pam_console.so

The first line controls that root does not allow telnet servers. To allow root to log in to the server through telnet, modify the file as follows:

#% PAM-1.0

# Commented out below line in order to allow root access for telnet

# auth required pam_securetty.so

Auth required pam_stack.so service=system-auth

Auth required pam_nologin.so

Account required pam_stack.so service=system-auth

Password required pam_stack.so service=system-auth

Session required pam_stack.so service=system-auth

Session optional pam_console.so

Once the modification is complete, the user can log in to the server as root:

[root@jaws root] # telnet 10.0.0.15

Trying 10.0.0.15...

Connected to 10.0.0.15.

Escape character is'^]'.

Red Hat Enterprise Linux AS release 3 (Taroon Update 5)

Kernel 2.4.21-32.0.1.ELsmp on an i686

Login: root

Password:

Last login: Sat Oct 22 11:58:56 from 10.0.0.25

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