I used certbot to set up an SSL certificate for my primary domain name and things were working well. I then added a certificate for a subdomain, and now the browser is telling me ERR_TOO_MANY_REDIRECTS for both URLs.

I figure something amiss in the nginx server block, but I don’t quite know what it is; everything looks look to me and sudo nginx -t check out.

Here’s how I added the certificates:

certbot -d tes.fm, www.tes.fm, office.tes.fm --expand

Here’s my server block. Does anything look out of place here?

# NextJS
server {
    server_name tes.fm www.tes.fm;

    root /var/www/tes-site;
    index index.html index.htm index.nginx-debian.html;

    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/tes.fm/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/tes.fm/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

    return 404; # managed by Certbot
}

# Statamic CMS
server {
    server_name office.tes.fm;

    root /var/www/tes-cms/public;
    index index.php;

    charset utf-8;
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }

    error_page 404 /index.php;

    location ~ \.php$ {
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
        include fastcgi_params;
    }

    location ~ /\.(?!well-known).* {
        deny all;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/tes.fm/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/tes.fm/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 ($host = www.tes.fm) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    if ($host = tes.fm) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80;
    listen [::]:80;
    server_name tes.fm www.tes.fm;
    return 404; # managed by Certbot
}

server {
    if ($host = office.tes.fm) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80;
    server_name office.tes.fm;
    return 404; # managed by Certbot
}