Are you running Mod Security? If so, what ruleset are you running? Comodo ruleset will give less false positives, but requires a paid CWP Pro license.
I'm using the Comodo default rules:
https://ibb.co/MGFyzC8I have the paid version:
https://ibb.co/7KkZ62rIt worked to upload stuff but till I reboot the system, so is something that changed after booting. Like ffmpeg doesn work, because when I upload a video, is processing the video and after I fill the name, description, choose the thumbnail, etc...and press upload stuck there, the page not reload or nothing just froze there.
And also I have in mysql conf the sql-mode = '' desactivated because ffmpeg will not work otherwise...so is a change when I activate the firewall to activate somehow the sql-mode? and also the ffmpeg to not work? But how I check?