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The site's security certificate is not trusted

PBIT asked
Last Modified: 2015-07-15

I am using a Samsung Galaxy S5 phone, Android version 4.4.2.  I visit a site with a https and shows a valid certificate on a Windows 8.1 PC with IE 11, but the same site shows an error on the Samsung phone.  The error is:

The site's security certificate is not trusted!  You attempted to reach www.family.com, but the server presented a certificate issued by an entity that is not trusted by your computer's operating system.

What can I do to have the phone show the site is secure?
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