Depois de tentar atualizar para a versão mais recente do Discourse pelo menu de administração, o processo falhou no meio e o site ficou fora do ar. (site)
O Discourse Doctor não ajudou.
You need to scroll up and find what hasn’t migrated …
it looks like you got another webserver running on your system. Try turning that off first.
I actually just have one droplet, one web server. I even removed the site from Cloudflare just in case. 
Step one here is figure out what is taking up port 443, as that is what the error indicates in your screenshot. What else is running on that machine?
I don’t know, maybe SMTP mail server. I tried this command Falco posted on another topic and but it doesn’t do anything anymore: netstat -tulpn | grep 443
I has same problem. @angus
But i check error from plugin quick-messages
and i action by remove it and new rebuild pass
@Bank_Live This should fix the quick messages issue:
However it’s not clear that this is the same isue as @nexo’s.
Thank you for update.
I guess that fixed it because I rebuilt my server again and it worked 