
If you see this message when viewing your store then it means that your site's SSL certificate isn't valid. This is generally caused because your web hosting provider will offer you an SSL certificate on your hosting plan, however the SSL certificate isn't registered specifically for your domain name, instead it is registered for *.yourhost.com, which means your site can use it, however your customers will always see the error message before they can get to your store.
To stop this error message appearing you need to buy your own SSL certificate for your web site. Your web hosting provider will be able to help you with this if you email/call them and simply say "Hi. I need an SSL certificate for my website. Can you please tell me how to buy and install it?". SSL certificates are relatively cheap, starting at around $100, and offer great peace of mind for customers in your store.

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