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Description of problem:
To have the PWD-LOCK flag be set, it requires both conditions in /etc/shadow line:
- start with "!"
- have password hash be alphanumerical
Second condition is almost never met since character set is [a-zA-Z0-9./]
Version-Release number of selected component (if applicable):
util-linux-2.23.2-52.el7.x86_64
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:3178