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Many people have experienced problems in the last week with installing SSL certificates, or they were able to upload the certificates but they were not used.
This problem has been fixed now. Any previously uploaded certificates have been activated on their relevant domain names and uploading new certificates should be working now.
Please note that changing SSL certificates can take a few days to take effect. Browsers (notably Google Chrome) tend to cache SSL certificates, so your browser may still show errors long after the valid SSL certificate has been installed.
You can verify this by checking your website in Private Browsing mode (which circumvents caches) or by using a third party SSL checker service.
If the SSL checkers say your SSL certificate is valid, but you still don't see a green lock, you need to wait for your browser's cache to expire. It's not a system issue, and there is nothing that can be done from the hosting side to fix it.
If you uploaded your SSL certificate, but SSL checkers say your certificate is still invalid after one hour, please reply to this topic with the domain name you're experiencing the issue on.