Over the past week, some of our users have encountered the well-known “Bad Cert Domain Subdomain SSL Error”. This problem can occur for many reasons. We will review them below.

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    Do subdomains inherit SSL?

    Yes, as a general rule, each subdomain will most likely need a separate SSL, simply because each subdomain is considered an additional domain. However, generic SSL certificates are available in the SSL marketplace.

    I have a example.com domain documented at namecheap.com and set up at DigitalOcean.I have a CNAME entry for the subdomain www:

    ssl error bad cert domain subdomain

    www.example.com. 1600 in CNAME example.com.
    # HTTP - redirect all requests to HTTPSserver     hear80;     listen[::]:80 default_server ipv6only=on;    returns 301 https://$host$request_uri;# HTTPS - serves generated HTML from /usr/share/nginx/html, proxy requests to /parse/# end-to-end analysis serverserver     hear 80;    server_name www.example.com;    returns 301 https://example.com$request_uri;server        hear 443;        server_name example.com;        root /home/example/website;         index.index.html index.htm;        SSL enabled;        Use the Let's Encrypt certificate and key until:        ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;        ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;        SSL_session_timeout 5m;        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;        ssl_prefer_server_ciphers is enabled;        ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';        UStriple number (http://www.westphahl.net/blog/2012/01/03/setting-up-https-with-nginx-and-startssl/)        add_header Strict transport security max-age=31536000;        add_header X-frame options DENY;        Number of send requests for /parse/ that the server instance on localhost: 1337 can parse.        place /analyze/                Proxy_Set_Header X-Real-IP $remote_addr;                Proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;                proxy_set_header X NginX proxy true;                Proxy_Pass http://localhost:1337/;                proxy_ssl_session_reuse disabled;                host proxy_set_header $http_host;                proxy redirection is disabled;                location ahead                try_files $uri $uri/ =404;        

    However, when I have problems opening www.example.com, Chromium shows the error SSL_ERROR_BAD_CERT_DOMAIN “Your connection is not secure”.

    Why SSL not working on subdomain?

    The problem is, if your own first-level subdomain has its own subdomain, called a second-level subdomain, your organization cannot use your wildcard in connection with it. Again, generic SSL certificates ONLY protect subdomains at the included level.Your problem is that your general SSL principle usually doesn’t work for the subdomains you need.

    ANSWER: Thanks to everyone who suggested this, the SSL certificate for publishing the www subdomain contains everything you need.

    How do I get an SSL certificate for a subdomain?

    To secure all subdomains in your region, you need a master wildcard certificate. You can buy PositiveSSL Wildcard, EssentialSSL Wildcard, and PremiumSSL Wildcard from Namecheap. The procedure for initial commissioning and installation of the universal instrument is the same as for the conventional instrument.

    ./letsencrypt-auto certonly --standalone -d example.com -d www.example.com

    Do SSL certificates work for subdomains?

    You can secure your main arena and unlimited subdomains at a basic level with just one subdomain SSL certificate. There are two different types of Generic SSL depending on the needs of your organization. Both types will certainly be available at the DV and OV approval levels.

    asked March 25, 2016 at 5:21 pm.

    Andrey GordeevAndrey Gordeev
    ssl error bad cert domain subdomain


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