When using telnet, I cannot become root with the su command. How can I enable root access for telnet?

Solution Verified - Updated -

Issue

  • When using telnet, I cannot become root with the su command. How can I enable root access for telnet?
  • How can I login as root when using telnet?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 3

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