I have installed the certificate for the domain, but it is showing the error “The certificate is not trusted because the issuer certificate is not trusted.”
This can be confusing for people who assume that any certificate issued by a commercial CA such as Thawte will be trusted by devices and web browsers that people are connecting from, especially when it occurs after renewing an existing Thawte SSL certificate.
Thawte has published the reason for this:
On June 27 2010, in the interest of better security, thawte signed all certificates with a primary and secondary intermediate that need to be installed along with the SSL certificate. Any certificate issued on or after this date requires the primary and secondary intermediate to be installed.
The new certificates are issued by an intermediate CA known as “Thawte SSL CA”. This CA is not automatically trusted by most web browsers
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