<![CDATA[NET::ERR_CERT_DATE_INVALID - Opera only problem]]>Hello
I hope someone can help out with this.

I am gettng the NET::ERR_CERT_DATE_INVALID message in a lot of pages, dozens daily.

It doesn't happen with Firefox, so I suspect it's not an OS problem.

I've tried lots of suggestions found online to no avail.

Help would be much appreciated so I don't have to ditch Opera for Firefox!

Thanks!

]]>https://forums.opera.com/topic/52573/net-err_cert_date_invalid-opera-only-problemRSS for NodeThu, 18 Jun 2026 08:58:57 GMTSat, 13 Nov 2021 10:30:50 GMT60<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Sun, 28 Nov 2021 07:53:19 GMT]]>@temminckiiii said in NET::ERR_CERT_DATE_INVALID - Opera only problem:

https://eclecticlight.co/2021/09/21/el-capitan-and-older-mac-os-x-are-about-to-have-a-security-certificate-problem/

This is perfect, thanks

]]>https://forums.opera.com/post/268456https://forums.opera.com/post/268456Sun, 28 Nov 2021 07:53:19 GMT<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Mon, 15 Nov 2021 18:07:18 GMT]]>@temminckiiii Seems to be working so far! Mac is on 10.11.6. Thanks!

]]>https://forums.opera.com/post/267356https://forums.opera.com/post/267356Mon, 15 Nov 2021 18:07:18 GMT<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Mon, 15 Nov 2021 16:19:12 GMT]]>@tomatitotarifa Please let me know if this solved your Opera problem. What version is your Mac?

]]>https://forums.opera.com/post/267327https://forums.opera.com/post/267327Mon, 15 Nov 2021 16:19:12 GMT<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Mon, 15 Nov 2021 16:02:36 GMT]]>@temminckiiii Ok... I've found on this page where to download the file ISRG Root X1 and installed it, hoping this works 😉 Thanks again

]]>https://forums.opera.com/post/267324https://forums.opera.com/post/267324Mon, 15 Nov 2021 16:02:36 GMT<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Mon, 15 Nov 2021 15:57:38 GMT]]>@temminckiiii I have also checked the certificates in my KeyChain and none of them are expired.

]]>https://forums.opera.com/post/267322https://forums.opera.com/post/267322Mon, 15 Nov 2021 15:57:38 GMT<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Mon, 15 Nov 2021 15:43:23 GMT]]>@temminckiiii said in NET::ERR_CERT_DATE_INVALID - Opera only problem:

https://letsencrypt.org/certificates/

Thanks for much for replying, I'be been looking at those pages but honestly don't understand how to download the new certificate. If there's a simple answer please tell me 😉 otherwise I'll keep looking see if I figure it out.

Thanks again. P.

]]>https://forums.opera.com/post/267320https://forums.opera.com/post/267320Mon, 15 Nov 2021 15:43:23 GMT<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Mon, 15 Nov 2021 15:12:32 GMT]]>Browsers other than Firefox generally use the operating system's facilities to decide which certificate authorities are trusted. Firefox instead had certificate list as part of the browser, but that has changed. Maybe you have an old version of Firefox. https://blog.mozilla.org/security/2021/07/28/making-client-certificates-available-by-default-in-firefox-90/

]]>https://forums.opera.com/post/267314https://forums.opera.com/post/267314Mon, 15 Nov 2021 15:12:32 GMT<![CDATA[Reply to NET::ERR_CERT_DATE_INVALID - Opera only problem on Mon, 15 Nov 2021 14:26:00 GMT]]>@tomatitotarifa Maybe this info helps you?
https://eclecticlight.co/2021/09/21/el-capitan-and-older-mac-os-x-are-about-to-have-a-security-certificate-problem/
https://www.eduhk.hk/ocio/content/faq-how-add-root-certificate-mac-os-x
https://letsencrypt.org/certificates/

This topic is discussed in Windows forum (also for Mac):
https://forums.opera.com/topic/51936/your-connection-is-not-private/16

]]>https://forums.opera.com/post/267311https://forums.opera.com/post/267311Mon, 15 Nov 2021 14:26:00 GMT