I installed my community by standard installation and checked discourse-doctor, but there is no problem. But I cannot open my website.
Have any ideas?
Does your host name resolve to your server’s ip?
What do you see in /var/discourse/shared/standalone/logs/var-log/nginx/error.log (that’s by memory and typed on a phone, so you might need to direct something).
lots of "cannot load certificate “/shared/ssl/example.com.cer”: BIO_new_file() failed (SSL: err>
That usually means that let’s encrypt didn’t get a certificate. Don’t know if you tried too many times or if there is some issue with let’s encrypt. There has been a spate of people reporting problems. I can’t tell if it’s broken somehow, or it’s just bad luck.
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Then should I change my domain? or change my instance?
You can try changing the subdomain name and making sure that the dns record resolves before you rebuild. Discourse-setup should check that the name resolves if you run it again.