My certificate works in my browser, but my visitors get a Security Alert that says 'The security certificate was issued by a company you have not chosen to trust...' What is the problem?
The issue is that your visitors’ browsers cannot correctly identify who issued your certificate. First, confirm that your visitors do not see an incorrect or outdated certificate. Once you have ensured that your visitors are seeing the correct certificate, the issue is most likely solved by installing the intermediate certificates.
Below are the links that you can use to download your intermediate certificate from the vendor website:
https://www.digicert.com/kb/digicert-root-certificates.htm
https://knowledge.digicert.com/generalinformation/INFO1421.html
https://knowledge.digicert.com/generalinformation/INFO1548.html
<https://support.comodo.com/index.php?/Knowledgebase/Article/View/320/17/can- i-download-your-intermediate-and-root-certificates>