SSL (Secure Sockets Layer) is an encryption protocol that provides a secure connection between your Web server and a online visitor's Web browser. A SSL certificate is used by a third party (such as a company) to provide private and secure transmission between the two people. Problems with a SSL certificate can block Web users from accessing your website.
Name Mismatch Error
A common SSL certificate problem is that the host name of your website doesn't match the names in the SSL certificate. For example, the SSL certificate may be http://yoursite.com, but you added your website with the "www" prefix. You will get a SSL certificate name error if a user types in http://www.yoursite.com, instead of http://yoursite.com.
SSL certificate errors may also occur if you have a self-signed certificate installed to your Web server. Self-signed SSL certificates are considered untrustworthy because they were not generated by a recognized certificate authority. Instead, they were generated by your Web server.
You will have SSL certificate problems if your SSL certificate is out of date, or if it is not yet valid. Contact your authorized SSL certificate provider in this case.
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