passwd: Module is unknown

Solution Verified - Updated -

Issue

  • we deleted the string '$ISA' from all the lines in /etc/pam.d/system-auth, now when we try and change any users password we get the following error:
# passwd testuser
Changing password for user testuser.
passwd: Module is unknown

Environment

  • Red Hat Enterprise Linux 4.8
  • x86_64

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