nginx page not found certbot安装后错误

Question

I have a http website (with Flask and nginx) which is up and running. I'm trying to install ssl with certbot and following their steps leads to a successful installation message (congratulations...) but refreshing my webpage leads to 404 Not Found nginx/1.18.0 (Ubuntu) . This is the nginx.conf file after sudo certbot --nginx

server {
    server_name www.mydomain.com;

    location /static {
        alias /home/ubuntu/adviser/flaskblog/static;
    }

    location / {
        proxy_pass http://localhost:8000;
        include /etc/nginx/proxy_params;
        proxy_redirect off;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/www.mydomain.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/www.mydomain.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}
server {
    if ($host = www.mydomain.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    server_name www.mydomain.com;
    return 404; # managed by Certbot


}

any help is really appreciated.

Answer 1

First, just remove this line:

return 404; # managed by Certbot

which causes 404 error to be returned.

If it doesn't help, change whole this block:

server {
    if ($host = www.mydomain.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    server_name www.mydomain.com;
    return 404; # managed by Certbot
}

to this:

server {
    listen 80;
    server_name www.mydomain.com;
    return 301 https://$host$request_uri;
}

UPDATE
Also, you can try to change

return 301 https://$host$request_uri;

to

return 301 https://www.yourdomain.com$request_uri;

(I had to replace mydomain with yourdomain due to some strange StackOverflow restrictions.)

Answer 2

I finally figured out what is the problem.

I was creating certificate for www.mydomain.com , but in reality I my domain was set to mydomain.com (no www). I was redirecting to www but either I was doing it wrong or certbot does not like redirects of that nature.

Long story short, I (re)issued certificate for mydomain.com and certificate worked like a charm!