I have installed a free Comodo SSL certificate to shared hosting for my domain. Totally 5 .crt files. However they have no effect. I cannot open my https://example.com domain.

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More detail needed. What happens exactly when you try to open your site? – joeqwerty Mar 23 '11 at 17:43
When I type https: //example .com Firefox says "Unable to connect, Firefox can't establish a connection to the server at example.com, etc." – george Mar 23 '11 at 18:50
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The HTTPS port (port 443) is closed. You need to tell Apache to listen on the HTTPS port. – Stefan Lasiewski Mar 23 '11 at 19:02
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Also note cert.gov issued a warning regarding Comodo issuing fraudulent SSL certificates for some very high profile domains today (login.live.com, mail.google.com), which is a very serious mistake. Many browsers issued updates to block these certificates. I wonder if these updates are blocking some other Certificates from Comodo SSL as well. – Stefan Lasiewski Mar 23 '11 at 19:46
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You need to set apache to listen on port 443 (in ports.conf or httpd.conf), you need at least create a virtualserver for port 443 and a config file pointing to the certificate. Tell us if you did that and what error do you have so we can try to help you solving your problem better.

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Sounds like he's using CPannel, and depending on how it's configured, all of these directions might be wrong for his host... – Chris S Mar 23 '11 at 18:09
@Chris S - You're right. I just wanted to give him a start on where to look if he was lost but it is true this is only valid for "normal" apache config. – laurent Mar 23 '11 at 18:27
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