Access CSF UI impossible

Hi guys,

I can’t access at the CSF UI.
“Connection failed”

Tested with ip and domain : NOK
I have upgrade the box, remove and reinstall CSF = NOK

Version of quickbox : 2.5.3

for the rest, all works : plex, rutorrent, couchpotato, etc

I followed turorials for let’s encrypt and certificats other programs.

thanks by advance for your help

Adding information