Many people recommend that you frequently update your software packages. However, sometimes updating packages isn't sufficient. If an update introduces or deprecates settings, then you may also need to change configuration files.
For instance, on Arch Linux, some package updates create a modified *.pacnew file. Look for such files (find / -name "*.pacnew" on your system, compare them with the existing file (diff -y conf conf.pacnew), and act accordingly.
@infosechandbook you should use pacdiff instead.
Indeed, but not everybody has pacman installed. So the best way to check this depends on your Linux distribution.
The important part was that people (esp. server admins) should update their package configurations from time to time.
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