Hi
If you use Apache, then Apache settings are the one you need to tweak, you are correct. LibreNMS is just “another website” from Apache point of view.
I am not aware of this particular setting specific issue, but Apache config can be split into multiple files usually, so you may have conflicting settings, site-specific settings, distribution specific, etc etc. You definitely need to ask on an Apache forum where you’ll find more answers.
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