In my Drupal 8 install I was getting an error about not setting the trusted_host_patterns variable not being enabled, in settings.php. This setting is not under D8 admin control. You need to directly edit the settings.php file. Ok, not difficult.
Unfortunately I was getting a permissions error every time i tried to edit the file. I tried changing the permissions but to no avail. It seems like permissions for the folder above was set too low, so I had to change that first, before I was able to save my changes to settings.php. So I then log in to D8 to see if the change cleared the error. At this point it looks like D8, or my host, reset the folder and settings.php permissions to default. For me, permissions need to be reset every time I need to do a change.
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Drupal 8: trusted_host_patterns error in settings.php
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