Testing SSL Certificates

Hi all,   At the moment I'm replacing excisting SSL certificates for one of our apps. Of course, I can check if the certificate works by going to the specific custom domain URL. An answer to this question may not be needed (if the certificate works) but still I'm very curious to know how you can test a SSL certificate, to make sure it works. Also, the other way around: if you can't reach your app by going to the specific URL, how can you know if the SSL certificate is the reason?   I've already came across an other post on this forum about an 400 Bad Request (https://community.mendix.com/link/questions/88059), but that may has something to do with the browser.   Greetings, Vianey
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