I cannot reach the https://www.isworkshop.eu site due to the NET::ERR_CERT_DATE_INVALID error.
Problem started yesterday (6-Oct-2021).

I have tried all 10 suggestions from https://kinsta.com/knowledgebase/net-err_cert_date_invalid/#how-to-fix-the-neterr_cert_date_invalid-error

What should I do?

Accept the "non existing risk" in your Browser.

https://www.istripper.com/forum/thread/48383/1?post=727131

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If i'm looking on the expiration details for the Certificate it says, Tue, 05 Oct 2021 23:59:59 GMT so it is expired but like @Wyldanimal mentioned already just click on the advanced Button and choose...

@Stanston
Many thanks for responding so quickly.
I am using Google Chrome (an Microsoft Edge occasionally).
I cannot find any reference to "non existing risk" in Chrome settings. Where is it?

@DrDoom9

the site you Linked to,
explains in the Top Section, how to access a site with a certificate Expiration Error.

"In most cases, the error won’t actually prevent you from accessing the site. You can ignore it and click through to the page you’re trying to visit, but we don’t recommend it."

I think in this Case, it's a website you have used 100's of times and know it is safe.
Now, if this was the very 1st time visiting a web site, and you see this error, Sure you might not want to
ignore the error and continue to the site.

But we know this is a legitimate and safe site.

NET::ERR_CERT_DATE_INVALID

In the case of this particular error, the certificate has expired.

It goes through it step by step for the most popular Browsers.

Google Chrome
The error text in Chrome explicitly states that your connection is not private. You can usually proceed to the site anyway by clicking on the Advanced button, but there is some risk involved:

Firefox
Firefox gets your attention by displaying a bright yellow outline around its security warning. As with Chrome, you can usually ignore the notice and proceed to the website by clicking on the Advanced button:


Microsoft Edge see Google Chrome above
Microsoft Edge’s error screen is nearly identical to the one Chrome displays. However, the Edge error may include how many days ago the site’s SSL certificate expired:
use the Advance Button...

Safari
If you’re using Safari, your warning may come in the form of a pop-up rather than a full screen. Again, it’s a straightforward process to continue to the potentially unsafe website by clicking on the Continue button:

At the Bottom, the 10 steps...
for this Error
NET::ERR_CERT_DATE_INVALID
they will NOT help in any way what so ever...

It's not a mistake of not being able to read the Certificate, it's an Expired Certificate.

Thanks! @Wyldanimal

@DrDoom9 please review these two Links as well in case you are running
in this issue with another trusted Site in the Future.

https://www.youtube.com/watch?v=Vmcj2EBNYAA

https://www.youtube.com/watch?v=r1nJT63BFQ0

https://www.youtube.com/watch?v=LRMBZhdFjDI

Please do not Accept! an expired Certificate or any other Certificates from Websites,
which is not on your preferred trusted List.

@WyldAnimal, @Stanston
Thank you so much for helping me.

WA told me the crucial thing I had missed - the Advanced button which appears on the error message in Chrome.
Sure enough, when I clicked that I was given the option to go to the site anyway, so I did, and it succeeded.

However, it seems that I now have to do this every time. What a *****!

I have seen the certificate. I think by clicking on something in the error message.
Sure enough, it was annual, and expired on 6-Oct-21.
But Who or How is it to be updated? Is it the site owner or me?

Everything from BigTech in California is just too f...g complicated!

But Who or How is it to be updated? Is it the site owner or me?

The site operator will have to renew the certificate; there's nothing further you can do on your end. I'm sure @lukaszr will get around to it soon. He's just a person providing this site for free; not a company, so it might take a minute.

You're right that the tech industry has made things far too complicated for the average user. Your browser should explain this issue in plain language that someone who isn't a tech specialist can understand. If @Wyldanimal and @Stanston can do it, Google can do it. It would be really useful for them to say something like, "The site operator probably just let their certificate lapse accidentally. If you trust this site, it's probably safe to continue."

Unfortunately we Humans like to make things complicated instead of looking for
an more simple Solution, just like Kiss > https://en.wikipedia.org/wiki/KISS_principle

But beside of that here is some more Input about this Subject.

https://www.youtube.com/c/SSLTrustAus/videos

And i wouldn't wonder if @lukaszr is running his Website on a Linux Server
and created his own Certificate.

https://www.youtube.com/watch?v=7YgaZIFn7mY

https://www.youtube.com/watch?v=oCl0gzLPPMI

New certificate has been installed and everything's fine now.

Thanks @lukaszr

@lukaszr
I use your excellent site nearly every day ... so
Thanks !