Hi, Leandro.
Check if the required sockets are enabled and active.
# systemctl is-enabled cockpit-user.socket cockpit.socket cockpit
enabled
enabled
static
# systemctl is-active cockpit-user.socket cockpit.socket cockpit
active
active
active
If it happens again, report its status before starting them manually.
systemctl -l status cockpit-user.socket cockpit.socket cockpit