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The site's security certificate is not trusted


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, 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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Chris Harte
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Is the time and date set correctly on your phone? Whenever I have seen this before it was because the date on the phone did not match the certificate.
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The time and date is set correctly on my phone.  It is updated automatically.
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I had to reinstall and the certificates on the web server.  That fixed everything.  Host company said there were certificates that were overlapping.