Absence of base domain certificate for SEO

I have the following situation:

Customer bought certificate for www.example.com instead of *.example.com , that's why when you go to https://example.com/ you can see: "Your connection is not private" ssl warning.

The questions are :

1) Does it have impact on SEO ?

2) Is it some workaround for that without asking for buying new certificate ?


Firstly, if the site is available via two URLs (www. and non-www.) then this in itself is an SEO problem. Google sees each URL iteration as a separate page so this may be causing a serious duplicate content issue.

You can read more about this and other causes of duplicate content here.

To answer your direct question - yes, the SSL warning will have an impact on SEO. As a rule of thumb with SEO, just ask yourself how something will impact a user's experience. If this answer is 'bad' then this is probably going to have a negative SEO effect as well.

To fix it, you need some redirects in place.

For an Apache server:

RewriteEngine on
RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L]

For Nginx:

server {
    listen 443 ssl;
    server_name example.com;

    ssl_certificate /srv/www/example.com/keys/ssl.crt;
    ssl_certificate_key /srv/www/example.com/keys/www.example.com.key;
    return 301 https://www.example.com$request_uri;

Hope this helps.

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