@temminckiiii Seems to be working so far! Mac is on 10.11.6. Thanks!

@temminckiiii Ok... I've found on this page where to download the file ISRG Root X1 and installed it, hoping this works Thanks again

@temminckiiii I have also checked the certificates in my KeyChain and none of them are expired.

@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.

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!