Then it is time to open a ticket with OVH and ask why with this particular VPS that port is closed and ask them to open it because I don’t have a firewall tool on their VPS.
Thank you very much for putting me on the track of the problem… that I’ve been dragging for a long time (this vps was the same of this ticket: Wrong url to access to hestiacp before install process)
*I will leave a report here if that was the problem, so that no one else wastes as much time as me.