Not able to use sudo, when pam_tally2 is enabled in Red Hat Enterprise Linux.

Solution Verified - Updated -

Issue

  • Not able to use sudo command.
  • Getting following error message on /var/log/messages:
Dec 9 23:53:45 hostname sudo: pam_unix(sudo:auth): conversation failed <===  
Dec 9 23:53:45 hostname sudo: pam_unix(sudo:auth): auth could not identify password for [test]
  • Does this message cause any system troubles?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • pam-1.1.1-8.el6.x86_64

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