Open the settings of Firefox browser. Then search with the keyword ‘certificate’ and disable “query ocsp responder servers to confirm the current validity of certificates”. Hopefully it will solve your problem.
Yep, this one did the job, thank you.
That fixed the issue. Thanks!
I don't know what other implications those setting could make, but this may be worth to take a look:
When Firefox web browser checks a security certificate, it also checks with the issuing authority if the certificate is valid. It appears that, near a certificate’s expiration date, the issuing authority may release a new certificate. The two certificates have conflicting expiration dates.
For reasons unknown, this caused Firefox to report a sec_error_revoked_certificate error and refuse to allow you to connect to the site!
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However, as Arjun mentioned, this will reduce the security of Firefox, since it disables the Online Certificate Status Protocol. Ideally, you should reset the setting to 1 after you finish with that site, and not load other pages while it is set to 0.
Trying it out now on Tor Browser, Firefox, Chromium, and Safari, it still does not work on my end.
EDIT:
It's working now. And I also check, the site now shows a new certificate:
➜ ~ curl -X POST -d 'fqdn=ninjastic.space' https://tls-alpn-check.letsencrypt.org/checkhost
[ninjastic.space]: The certificate retrieved from your web server has serial 040621bb9cb494ab87e1afb0638a1b2b20fe, which is different than the serial in our affected data set. Your certificate has most likely been renewed. Everything appears good.