nginx, nextcloud, onlyoffice

При попытке соединения возникла ошибка (cURL error 7: Failed to connect to onlyoffice.zs**.ru 
port 443 after 18 ms: Connection refused (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://onlyoffice.zs**.ru/healthcheck)

server {
    listen 80;
    listen [::]:80;
    server_name onlyoffice.zs**.ru;

    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name onlyoffice.zs**.ru;

    ssl_certificate /etc/letsencrypt/live/onlyoffice.zs**.ru/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/onlyoffice.zs**.ru/privkey.pem;

    location / {
        proxy_pass [URL=http://linuxshop.ru/go/?link=http://192.168.108.202/;]http://192.168.108.202/;[/URL]
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        # These lines make sure that OnlyOffice can communicate with Nextcloud
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Forwarded-Ssl on;
        proxy_set_header X-Url-Scheme $scheme;
        proxy_buffering off;

        # This line makes sure that OnlyOffice can communicate with Nextcloud
        add_header 'Access-Control-Allow-Origin' '*';

        # Proxy timeouts
        proxy_connect_timeout       600;
        proxy_send_timeout          600;
        proxy_read_timeout          600;
        send_timeout                600;
    }
}

server {
    server_name cloud1.zs**.ru;
    location / {
        proxy_pass [URL=http://linuxshop.ru/go/?link=http://192.168.108.201;]http://192.168.108.201;[/URL]
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        rewrite ^/.well-known/carddav /remote.php/dav/ permanent;
        rewrite ^/.well-known/caldav /remote.php/dav/ permanent;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/cloud1.zs**.ru/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/cloud1.zs**.ru/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
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
}
server {
    if ($host = cloud1.zs**.ru) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    server_name cloud1.zs**.ru;
    return 404; # managed by Certbot


}