I’ve configured two nodejs apps and launched them using pm2.

• domain.link - running on port 8080
• auth.domain.link - running on port 3000

I’ve configured nginx for domain.link and everything is working fine.

server {

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

server_name domain.link www.domain.link;

location / {
        proxy_pass http://localhost:8080;
        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; # managed by Certbot
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/domain.link/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/domain.link/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 ($host = www.domain.link) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


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


    listen 80;
    listen [::]:80;

    server_name domain.link www.domain.link;
    return 404; # managed by Certbot

}

The second app I’ve configured very similar:

server {

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

server_name auth.domain.link www.auth.domain.link;

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/auth.domain.link/fullchain.pem; # managed by Certbot
        ssl_certificate_key /etc/letsencrypt/live/auth.domain.link/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 ($host = www.auth.domain.link) {
            return 301 https://$host$request_uri;
        } # managed by Certbot


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


        listen 80;
        listen [::]:80;

        server_name auth.domain.link www.auth.domain.link;
        return 404; # managed by Certbot

}

Unfortunately, when I go to auth.domain.link, I’ve got an error ERRTOOMANY_REDIRECTS. What should I change in my configuration?

Thanks in advance