Gitlab: SSL cannot renew

 https://stackoverflow.com/questions/58840329/problem-binding-to-port-80-could-not-bind-to-ipv4-or-ipv6

gitlab-ctl stop

letsencrypt certonly --standalone -d gitlab.*.com

You must stop your server before you run certbot.

That’s your problem–if your application is listening on port 80, then certbot can’t listen on that port, and therefore it can’t run. https://community.letsencrypt.org/t/problem-binding-to-port-80-with-standalone/50850/4

Then rerun the certbot command and of course start your web server again to continue broadcasting your sites.