@ramiroro If you do systemctl restart box, you will something like this in box.log
2024-08-20T19:07:19.792Z box:directoryserver starting server on port 3004
lsof will show the listen
# lsof -n -i :3004 | grep LISTEN
node 78452 yellowtent 26u IPv6 517617 0t0 TCP *:3004 (LISTEN)
check the rediect from 636 to 3004
# iptables -t nat -L | grep 3004
REDIRECT tcp -- anywhere anywhere tcp dpt:ldaps redir ports 3004
test with telnet my.domain.com 636 . Note that if you are behind Cloudflare this won't work.